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Science for Kids

The Earth's Atmosphere

The earth is surrounded by a layer of gases called the atmosphere. The atmosphere is very important to life on Earth and does many things to help protect life and help life to survive.

A Big Blanket

The atmosphere protects Earth like a big blanket of insulation. It absorbs the heat from the Sun and keeps the heat inside the atmosphere helping the Earth to stay warm, called the Greenhouse Effect. It also keeps the overall temperature of the Earth fairly steady, especially between night and day. So we don't get too cold at night and too hot during the day. There is also a portion of the atmosphere called the ozone layer. The ozone layer helps to protect the earth from the Sun's radiation.

This big blanket also helps to form our weather patterns and climate. The weather keeps too much hot air from forming in one place and causes storms and rainfall. All of these things are important to life and the Earth's ecology.


The atmosphere is the air that plants and animals breathe to survive. The atmosphere is made up of mostly nitrogen (78%) and oxygen (21%). There are lots of other gases that are part of the atmosphere, but in much smaller amounts. These include argon, carbon dioxide, neon, helium, hydrogen, and more. Oxygen is needed by animals to breathe and carbon dioxide is used by plants in photosynthesis.

Layers of Earth's Atmosphere

The Earth's atmosphere is divided up into 5 major layers:
  • Exosphere - The last layer and the thinnest. It goes all the way to 10,000 km above the Earth's surface.
  • Thermosphere - The thermosphere is next and the air is very thin here. Temperatures can get extremely hot in the thermosphere.
  • Mesosphere - The mesosphere covers the next 50 miles beyond the stratosphere. This is where most meteors burn up upon entry. The coldest place on Earth is at the top of the mesosphere.
  • Stratosphere - The stratosphere extends for the next 32 miles after the troposphere. Unlike the troposphere the stratosphere gets its heat by the Ozone Layer absorbing radiation from the sun. As a result, it gets warmer the further away you get from the Earth. Weather balloons go as high as the stratosphere.
  • Troposphere - The troposphere is the layer next to the ground or surface of the Earth. It covers around 30,000-50,000 feet high. This is where we live and even where planes fly. Around 80% of the mass of the atmosphere is in the troposphere. The troposphere is heated by the surface of the Earth.
Where does Outer Space start?

There is no clear definition between the Earth's atmosphere and outer space. There are a few official guidelines, most are between 50 and 80 miles from the surface of the Earth.

Activities Earth Science Experiment:
Air Pressure and Weight - Experiment with air and discover that it has weight.

Earth Science Subjects

Composition of the Earth
Plate Tectonics
Soil Science
The Water Cycle
Geology Glossary and Terms

Nutrient Cycles
Food Chain and Web
Carbon Cycle
Oxygen Cycle
Water Cycle
Nitrogen Cycle
Atmosphere and Weather
Dangerous Weather
Weather Forecasting
Weather Glossary and Terms

World Biomes
Biomes and Ecosystems
Tropical Rainforest
Temperate Forest
Taiga Forest
Coral Reef
Environmental Issues
Land Pollution
Air Pollution
Water Pollution
Ozone Layer
Global Warming

Renewable Energy Sources
Renewable Energy
Biomass Energy
Geothermal Energy
Solar Power
Wave and Tidal Energy
Wind Power

Ocean Waves and Currents
Ocean Tides
Ice Age
Forest Fires
Phases of the Moon

Science >> Earth Science for Kids

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