Kainite
Some rocks are very special. This rock can be white or blue. It is soft and can taste bitter. It helps plants grow in soil. We find it in salt mines. Have you ever seen a blue rock?
Early Reader · Change the reading level on the articleEarth Science articles — Page 18
Explore rocks, volcanoes, weather, oceans and the processes that shape Earth. Choose an article below; its reading controls let you move between the available levels.
1,427 public articles · Page 18 of 30
K–Ar dating
Rocks can tell us how old they are. Some rocks have tiny bits of gas inside. This gas stays trapped when rock gets hard. We can count the gas to find the age. It helps us learn about the Earth. Do you want to be a…
Early Reader · Change the reading level on the articleKatabatic wind
Cold air moves down a hill. It is heavy and fast. This happens when the air gets cold. It flows into low spots. This wind can be very strong. It can even blow snow away. Do you feel the wind?
Early Reader · Change the reading level on the articleKatharine Hayhoe
Katharine studies the air and weather. She works at a big school. She helps people learn about our world. Her work helps keep us safe. She is a very smart leader. Do you want to learn about the air?
Early Reader · Change the reading level on the articleKatia and Maurice Krafft
Katia and Maurice loved volcanoes. They went to see them. They took many photos. They made films of the fire. Their work helped people stay safe. They died at a volcano. Do you like volcanoes?
Early Reader · Change the reading level on the articleKavir Buzurg
The Kavir Buzurg is a big salt place. It is in a dry land. Salt crusts sit on top of wet mud. The ground can be soft and tricky. It is not a safe place to walk. Most people live on the hills nearby. Do you like to…
Early Reader · Change the reading level on the articleKenorland
A long time ago, the land was one. It was a huge piece of land. The land broke into many parts. This made the world very cold. It was a big change for Earth. Can you imagine a world of ice?
Early Reader · Change the reading level on the articleKerguelen Plateau
A big land sits under the sea. It is near Australia. It is very large. Some small islands stay above the water. Whales like to swim here for food. Do you like the ocean?
Early Reader · Change the reading level on the articleKernite
Kernite is a white rock. It can look like small grains. It is found in dry places. We use it to make soap. This helps us stay clean. It is a neat find. Do you like soap?
Early Reader · Change the reading level on the articleKīlauea
Kīlauea is a big volcano. It is in Hawaii. Hot red lava comes out of it. This lava can change the land. It is very active. Do you like to see volcanoes?
Early Reader · Change the reading level on the articleKimberlite
This is a special rock. It comes from deep in the Earth. It often carries shiny diamonds. These rocks help us find gems. It is a very cool find! Do you like shiny things?
Early Reader · Change the reading level on the articleKlyuchevskaya Sopka
This is a very big mountain. It is a volcano. It can blow out hot rocks. It also makes clouds of ash. This mountain is very tall. It is in a place called Siberia. Do you like big mountains?
Early Reader · Change the reading level on the articleKobe earthquake
A big shake hit a city in Japan. It happened in the morning. The ground moved for a short time. It broke many roads and houses. People helped each other after. Have you ever felt the ground shake?
Early Reader · Change the reading level on the articleKomatiite
This is a very old rock. It came from hot lava. The lava was very hot. It flowed like water. This rock is hard and rare. Can you find it in the ground?
Early Reader · Change the reading level on the articleKoryaksky
This is a big volcano. It is in a place called Russia. It can blow out hot, red rock. This can be very loud. It is a wild place to see. Do you like big mountains?
Early Reader · Change the reading level on the articleKuril–Kamchatka Trench
There is a deep spot in the sea. It is in the big ocean. The spot is very, very deep. It helps make islands and volcanoes. It is a busy place under the waves. Can you imagine a place that deep?
Early Reader · Change the reading level on the articleKyanite
This is a blue stone. It looks like long blades. It is found deep in the Earth. We use it to make dishes. It is very pretty. Do you like blue?
Early Reader · Change the reading level on the articleKyoto Protocol
Many countries made a big plan. They wanted to help our Earth. The plan helps keep our air clean. This helps the world stay cool. It is a very big job. Do you want to help too?
Early Reader · Change the reading level on the articleLaacher See
This is a big lake. It sits in a hole in the ground. A hot mountain made it long ago. The water stays in the hole. It is a pretty place to see. Do you like lakes?
Early Reader · Change the reading level on the articleLa Amistad International Park
This is a big forest. It is in two lands. Many wild cats live here. Many colorful birds fly in the trees. It is a special place for nature. Can you see the green trees?
Early Reader · Change the reading level on the articleLabradorite
Some rocks have bright colors. They look like a rainbow. These rocks come from far away. They can be blue or green. They can even be pink! It is so pretty to see. Do you like bright colors?
Early Reader · Change the reading level on the articleLahar
A lahar is a big mud flow. It moves down a mountain. It is made of rocks and water. It can be very fast. It can break buildings. It is a very strong force. Have you ever seen mud move?
Early Reader · Change the reading level on the articleLake Assal (Djibouti)
There is a special lake in Djibouti. It is very salty. The water is deep and blue. The salt looks like white snow. People get salt from the water. It is a very hot place. Do you like the beach?
Early Reader · Change the reading level on the articleLake Bonneville
A long time ago, there was a giant lake. It was much bigger than it is now. The lake was very deep and wide. It covered much of the land. Now, we only see small lakes there. Can you find where the big lake was?
Early Reader · Change the reading level on the articleLake stratification
Lakes can have layers of water. The top part is warm. The bottom part is cold. This happens in warm weather. It helps the fish in the lake. Do you like to swim in a lake?
Early Reader · Change the reading level on the articleLake Tahoe
Lake Tahoe is a very big lake. It sits near high mountains. The water is very clear. You can see many trees around it. It is a fun place to visit. Do you like big lakes?
Early Reader · Change the reading level on the articleLake Toba
Lake Toba is a very big lake. It is in a place called Sumatra. A giant volcano made this lake a long time ago. It is the biggest lake like this in the world. It is a beautiful place to see. Have you seen a lake this big?
Early Reader · Change the reading level on the articleLake Tritriva
This is a big lake. It sits in a deep hole. The hole was made by a volcano. It is the deepest lake in its land. You cannot swim in the water. It is a special place. Have you seen a big lake?
Early Reader · Change the reading level on the articleLand and water hemispheres
Earth has two big sides. One side has much land. The other side has much water. Most people live on the land side. It has many big lakes too. It is a big world. Can you find the land on a map?
Early Reader · Change the reading level on the articleLand change science
People study how our land changes. They look at trees and cities. This helps us take care of Earth. It helps us keep our world healthy. We can learn to help our home. Do you like to look at trees?
Early Reader · Change the reading level on the articleLandspout
A landspout is a spinning wind. It looks like a long rope. It forms under a growing cloud. It can lift dust from the ground. We must stay safe from big winds. Have you seen a spinning cloud?
Early Reader · Change the reading level on the articleLapis lazuli
Lapis lazuli is a deep blue rock. It has gold spots in it. People use it to make pretty jewelry. It was used a long time ago. It is very special to see. Do you like the color blue?
Early Reader · Change the reading level on the articleLa Portada
There is a big stone arch. It sits by the blue sea. The sea made it long ago. It has old shells in the rock. You can see birds flying there. It is a special place. Do you like the ocean?
Early Reader · Change the reading level on the articleLaramide orogeny
Long ago, the land moved. It pushed up big mountains. These mountains are the Rocky Mountains. They help make our world look grand. We can see them today. Do you like big mountains?
Early Reader · Change the reading level on the articleLarge igneous province
Big rocks can cover the land. Hot melted rock moves up. It fills up huge spaces. This can change our world. It can even change the air. Can you find big rocks near you?
Early Reader · Change the reading level on the articleLast Glacial Maximum
Long ago, the Earth was very cold. Huge sheets of ice covered the land. The sea was much lower too. This made many lands join together. Most places were dry and dusty. It was a very different world. Can you imagine…
Early Reader · Change the reading level on the articleLast Glacial Period
Long ago, the world was very cold. Big sheets of ice covered the land. This was the last ice age. It changed how the earth looked. It was a very different time. Can you imagine living in the ice?
Early Reader · Change the reading level on the articleLate Paleozoic icehouse
A long time ago, Earth was very cold. Big sheets of ice covered the land. This lasted for a very long time. It changed how the world looked. Do you like the snow?
Early Reader · Change the reading level on the articleLaurasia
Long ago, the land was one big piece. This big land broke into parts. One part was called Laurasia. It moved to the north. It is part of our world today. Can you find the north on a map?
Early Reader · Change the reading level on the articleLaurentia
Laurentia is a very old part of Earth. It is the core of North America. It helps make our land stay still. It is very big and strong. We live on it today! Can you find it on a map?
Early Reader · Change the reading level on the articleLava dome
A lava dome is a big mound. It comes from a volcano. The hot rock is very thick. It does not flow far. It stays in a round shape. This makes a hill of rock. Can you see the shape?
Early Reader · Change the reading level on the articleLava field
A lava field is a big land of rock. It is made from hot liquid rock. The rock flows out and cools down. It can look like a flat sheet. It can also look like a pile of pillows. It is very dark and pretty. Have you…
Early Reader · Change the reading level on the articleLava tube
Hot melted rock makes a cave. The top cools and gets hard. It makes a roof. The inside stays hot and flows. Then the rock drains away. Now it is a tunnel. Can you imagine walking in one?
Early Reader · Change the reading level on the articleLa Verna Cave
There is a huge cave in France. It has a giant room inside. A river falls down the wall. Small bugs live in the dark. We can visit this place now. Do you want to see it?
Early Reader · Change the reading level on the articleLaw of superposition
Rocks form in many layers. Old rocks stay at the bottom. New rocks sit on the top. This helps us learn about time. It is like a tall stack. Can you see the layers?
Early Reader · Change the reading level on the articleLazurite
Some rocks are a deep blue. They make up a stone called lapis lazuli. People use them to make paint. They also make cloth blue. It is a very old stone. Can you find something blue?
Early Reader · Change the reading level on the articleLechuguilla Cave
There is a giant cave deep underground. It has many bright shapes inside. Some look like yellow rocks. Others look like tiny pearls. We can learn a lot there. Do you want to see it?
Early Reader · Change the reading level on the articleLedenika
This is a big cave. It is in the mountains. You can see rocks that hang from the top. Some rocks grow from the floor. In winter, it gets very icy. It is a cool place to visit. Do you want to go inside?
Early Reader · Change the reading level on the article