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| The study of objects beyond earth's atmosphere. |
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| The study of the atmosphere, which is the air surrounding the Earth. |
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Definition
| The study of the materials that make up Earth and the processes that form and change these materials, and the history of the planet and its life forms since its origin. |
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| The study of Earth's oceans including the creatures than inhabit its waters, its physical and chemical properties and the effects of human activities. |
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| The study of the interactions of humans and their environment. |
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Definition
| The part of Earth from its surface to its center. |
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Definition
| The blanket of gasses surrounding the earth that contain about 78 percent nitrogen, 21 percent oxygen, and 1 percent other gasses such as argon, carbon dioxide and water vapor. |
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Definition
| All the water in earths oceans, lakes, seas, rivers, and glaciers, plus all the water in the atmosphere. |
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Definition
| The frozen portion of water on Earth's Surface. |
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Definition
| All of the Earth's organisms and the environments in which they live. |
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