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Mantle: The thickest layer, about 1,800 miles (2,900 kilometers) thick, made of hot, viscous rock.
Crust: The outermost solid layer, averaging 19 miles (30 kilometers) thick on land and about 3 miles (5 kilometers) under the oceans.
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Climate and Weather
Earth's climate is regulated by its atmosphere and oceans. The greenhouse effect, primarily due to water vapor and carbon dioxide, maintains an average surface temperature of about 14.76°C (58.57°F), allowing water to remain liquid. The tilt of Earth's axis causes seasonal variations in climate.
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Human Impact
Human activities have significantly altered Earth's environment, contributing to climate change, pollution, deforestation, and biodiversity loss. The release of greenhouse gases is causing global warming, melting glaciers, rising sea levels, and shifting ecosystems.
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Fun Facts
Earth is not named after a Greek or Roman deity; its name comes from Old English and Germanic words meaning "the ground".
The planet has no rings.
The longest mountain range on Earth is underwater, at the bottom of the Arctic and Atlantic oceans.
Earth remains the only planet known to support life, with its unique combination of liquid water, protective atmosphere, and dynamic geology.
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