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Glossary - Xx Yy Zz
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Located in
Science
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Chemistry
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Glossary
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Structure of the Earth
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The Earth consists of several atmospheric, hydrologic, and mainly geologic layers. Its components are the crust, the mantle, and its core.
Located in
Geography
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Physical Geography
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Earth
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Earth's atmosphere
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Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen, with trace amounts of other gases. This mixture of gases is commonly known as air. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation and reducing temperature extremes between day and night.
Located in
Geography
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Physical Geography
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Earth
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Tectonic Plates
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Plate Tectonics, theory that the outer shell of the earth is made up of thin, rigid plates that move relative to each other. The theory of plate tectonics was formulated during the early 1960s, and it revolutionized the field of geology.
Located in
Geography
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Physical Geography
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Earth
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Glossary
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Located in
Geography
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Physical Geography
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Earth
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The Water Cycle
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The water cycle—technically known as the hydrologic cycle—is the circulation of water within the earth's hydrosphere, involving changes in the physical state of water between liquid, solid, and gas phases.
Located in
Geography
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Physical Geography
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The Water Cycle
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Clouds
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A cloud is a visible mass of condensation droplets or ice crystals suspended in the atmosphere above the surface of the Earth.
Located in
Geography
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Physical Geography
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The Water Cycle
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Types of Clouds
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Clouds are classified into a system that uses Latin words to describe the appearance of clouds as seen by an observer on the ground.
Located in
Geography
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Physical Geography
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The Water Cycle
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The World
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Located in
Geography
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Country Information
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Antarctica
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Located in
Geography
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Country Information
