Greenhouse gas emissions
People make gases that trap heat. These gases stay in the air. They make the Earth warmer. This can change our world. We must learn about it. Do you want to learn more?
Early Reader · Change the reading level on the articleEarth Science articles — Page 16
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 16 of 30
Greenockite
This is a rare rock. It can look honey yellow. It can even look red. People use it to make batteries. It is very special. Can you find a yellow rock?
Early Reader · Change the reading level on the articleGreensburg tornado
A big wind storm hit a town. It was called a tornado. The wind was very strong. It broke many homes. Now, the town is being built back. They use wind to make power. It is a green town now. Can you see the new buildings?
Early Reader · Change the reading level on the articleGreenschist
This rock is green. It comes from deep in the ground. Heat and weight change it. It can break into thin layers. People used it to make tools long ago. Do you like green rocks?
Early Reader · Change the reading level on the articleGreenstone belt
Some rocks look very green. They can be very long. These rocks hold gold and silver. They help us learn about our Earth. Can you find green rocks?
Early Reader · Change the reading level on the articleGreisen
Some rocks change over time. Hot liquids move through them. These liquids bring new bits. This makes the rock look different. We can find tin in them. It is a neat surprise! Can you find a rock?
Early Reader · Change the reading level on the articleGreywacke
This is a dark, hard rock. It is made of sand and tiny bits of other rocks. It can be grey or black. People use it to make statues. It is very strong. Can you find a dark rock?
Early Reader · Change the reading level on the articleGroundwater recharge
Rain falls down to the ground. The water sinks into the soil. It moves deep under our feet. This fills up big pools of water. This water is very helpful to us. Can you find water in the ground?
Early Reader · Change the reading level on the articleGroundwater remediation
Some water is deep under the ground. This water can get dirty. People work to make it clean again. They use plants or air to help. Clean water helps us stay well. Do you like to drink water?
Early Reader · Change the reading level on the articleGroup (stratigraphy)
Rocks can form big sets. These sets have many layers. Some layers are thin. Some layers are thick. They help us map the land. It is like a big book of stone. Can you find rocks in the dirt?
Early Reader · Change the reading level on the articleGrowing season
Plants need good weather to grow. They need sun and rain. Warm soil helps them too. This time is the growing season. It helps us have food. Do you like to see plants grow?
Early Reader · Change the reading level on the articleGuarani Aquifer
There is a lot of water underground. It is under the ground. This water is very clean. It helps many people drink. We must keep it safe. Can you find water near you?
Early Reader · Change the reading level on the articleGulf of Maine
The Gulf of Maine is a big part of the ocean. It is near the land. The water is very cold there. Many fish and lobsters live in it. It is a busy place for sea life. Do you like the ocean?
Early Reader · Change the reading level on the articleGully
Rain can make big holes in the ground. The water washes the dirt away. These holes look like small valleys. They can grow very large. This can hurt the farms where we grow food. Have you ever seen a deep hole in the…
Early Reader · Change the reading level on the articleGustnado
A big storm can make a wind swirl. It looks like a small tornado. It is just a quick spin of air. It can move things on the ground. We must stay safe from fast winds. Have you seen a wind swirl before?
Early Reader · Change the reading level on the articleGuyot
Some mountains live under the sea. They have very flat tops. They look like big tables. Long ago, they were islands. Now they are deep down. They help us learn about Earth. Do you like big mountains?
Early Reader · Change the reading level on the articleHadal zone
The deep ocean is very dark. It is at the very bottom. It is in long, deep cracks. It is a hard place to live. Many small things live there. Can you imagine the deep sea?
Early Reader · Change the reading level on the articleHadean
The Earth was once very hot. It was made of red lava. Then, big oceans of water grew. The Earth became a water world. It was a very wild time. Do you like the ocean?
Early Reader · Change the reading level on the articleHaleakalā
Haleakalā is a giant mountain. It is a volcano. It makes up most of the island. People go there to see the sun rise. It is a very big place. Do you want to see it?
Early Reader · Change the reading level on the articleHalide mineral
Some rocks are special. They are called halides. One kind is salt. We use salt on food. Other kinds are hard and bright. They can be found in dry deserts. Do you like salt?
Early Reader · Change the reading level on the articleHalo (optical phenomenon)
You can see rings in the sky. These are called halos. They come from tiny bits of ice. The ice catches the light. It makes a bright circle. It might mean rain is coming. Have you seen one?
Early Reader · Change the reading level on the articleHammam Maskhoutine
Hot water flows in a deep valley. The water comes from the ground. It is very hot. You can even cook eggs in it! The walls are many colors. It is a pretty place to see. Do you like warm water?
Early Reader · Change the reading level on the articleHardiness zone
Some places are very cold. Some places are very warm. This helps us know which plants can live there. It helps us grow food. Do you like to garden?
Early Reader · Change the reading level on the articleHarmattan
A dry wind blows in West Africa. It carries dust from the sand. The air feels very dry. It can be cold at night. It can be hot during the day. This wind can make the sky look gray. Do you like dry air?
Early Reader · Change the reading level on the articleHauyne
This is a blue stone. It can be bright blue. It can also be pink or green. Some people use it for jewelry. It is a very rare find. Do you like blue stones?
Early Reader · Change the reading level on the articleHawaiian–Emperor seamount chain
There is a long line of mountains. They hide under the deep blue sea. Some mountains poke out to make islands. These islands help many animals live. It is a big, cool place. Do you like the ocean?
Early Reader · Change the reading level on the articleHawaii hotspot
Hot spots make islands. A hot spot is deep under the sea. It makes fire rocks rise up. These rocks make islands like Hawaii. The islands move over the hot spot. Do you like islands?
Early Reader · Change the reading level on the articleHaze
Haze is in the air. It can be dust or smoke. It makes the sky look cloudy. It can hide the sun. This makes it hard to see far away. Can you see the sun through the haze?
Early Reader · Change the reading level on the articleHeat wave
The sun makes it very hot. This stays hot for many days. It can feel too warm for us. It can even hurt the grass. We must stay cool. Do you like the sun?
Early Reader · Change the reading level on the articleHectorite
Some clay is white and soft. It feels a bit greasy. It comes from old ash. We use it to make things for our skin. It is very special. Do you like soft clay?
Early Reader · Change the reading level on the articleHedenbergite
This is a dark rock. It can be green or brown. It is very hard. It is hard to find in the wild. It can even come from space! Do you like looking at rocks?
Early Reader · Change the reading level on the articleHeight above mean sea level
We use the sea to measure height. It tells us how high a mountain is. It also tells us how high a plane flies. This helps us know where we are. It is a very useful tool. Do you know how high you are?
Early Reader · Change the reading level on the articleHekla
Hekla is a big volcano. It is in a land called Iceland. It can blow out hot rocks. This can be very loud. It makes a lot of ash. Do you like big mountains?
Early Reader · Change the reading level on the articleHematite
This rock is red or gray. It can be found in the ground. People use it to make iron. It can also make red paint. It is a very cool find. Do you like red rocks?
Early Reader · Change the reading level on the articleHemimorphite
This is a special rock. It can look like tiny needles. One end is blunt. The other end is sharp. It helps us find metal. It is very pretty to see. Do you like shiny rocks?
Early Reader · Change the reading level on the articleHighland
Highlands are very high lands. They have big hills or mountains. Some parts are very cold. They may even have snow. You can see them in many places. Do you like to climb hills?
Early Reader · Change the reading level on the articleHirnantian glaciation
A long time ago, Earth got very cold. Ice grew in many places. The oceans became much colder too. This change was hard for sea life. Many animals did not make it. Can you imagine a world of ice? It was a very…
Early Reader · Change the reading level on the articleHistorical geology
We can learn about our old Earth. Rocks tell us a story. They show how things changed. We can see how life grew. It helps us know our home. Do you like old stories?
Early Reader · Change the reading level on the articleHistory of climate change science
Our world changes over time. The air can get warm. Some gases trap heat like a blanket. This helps keep us warm. People have studied this for a long time. Do you like the sun?
Early Reader · Change the reading level on the articleHistory of geophysics
People want to know about Earth. We study how the world works. We look at volcanoes and the sea. This helps us stay safe. It also helps us find water. Do you like to explore the world?
Early Reader · Change the reading level on the articleHistory of mineralogy
People have studied rocks for a long time. Long ago, people wrote about gems. They wanted to know how they grow. Now we use tools to see them. It is a fun way to learn. Do you like shiny stones?
Early Reader · Change the reading level on the articleHölloch
This is a very long cave. It is in a place called Switzerland. The cave is very deep. It is one of the longest in the world. Many people go to see it. Do you like dark caves?
Early Reader · Change the reading level on the articleHorace Bénédict de Saussure
A man named Saussure loved the mountains. He climbed high snowy peaks. He studied rocks and plants. He even made a box to catch sun heat. His work helps us know our world. Do you like to explore outside?
Early Reader · Change the reading level on the articleHornblende
This is a dark rock. It can be green or black. It is found in many rocks. It looks like a shiny metal. It is very cool to find! Can you find a dark rock?
Early Reader · Change the reading level on the articleHornfels
Some rocks get very hot. This heat bakes them hard. They can look like dark stone. They can even look like horns. These rocks are very tough. Do you want to find one?
Early Reader · Change the reading level on the articleHumid subtropical climate
Some places have hot summers. They also have mild winters. The air feels wet and warm. Rain can fall from big storms. This weather is in many lands. It can be near the sea. Do you like warm weather?
Early Reader · Change the reading level on the articleHummock
A hummock is a small mound. It looks like a tiny hill. These hills often grow in groups. Some are made of ice. Some are made of dirt. They can change fast. Can you find a tiny hill?
Early Reader · Change the reading level on the articleHumus
Humus is dark soil. It is under the leaves. It comes from old plants and animals. It helps the ground stay wet. This helps plants grow big. It is very good for the earth. Do you like to dig in the dirt?
Early Reader · Change the reading level on the article