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A rabbit carcass decomposes in a rocky desert valley.

Pre-K - Higher Ed
A rabbit carcass decomposes in a rocky desert valley.
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Wind cups on shafts spin on a wind gauge.

Pre-K - Higher Ed
Wind cups on shafts spin on a wind gauge.
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Small, puffy clouds float over the Citadel of Qaitbay in Alexandria, Egypt.

Pre-K - Higher Ed
Small, puffy clouds float over the Citadel of Qaitbay in Alexandria, Egypt.
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The wind spins wind cups on a wind gauge.

Pre-K - Higher Ed
The wind spins wind cups on a wind gauge.
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HD: Rainbow

Pre-K - Higher Ed
HD1080i: Colorful rainbow in the countryside.
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A wind gauge operates under a sunny, partly cloudy sky.

Pre-K - Higher Ed
A wind gauge operates under a sunny, partly cloudy sky.
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The sun shines on pillars covered with hieroglyphs in an ancient temple.

Pre-K - Higher Ed
The sun shines on pillars covered with hieroglyphs in an ancient temple.
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Clouds hover over New York City skyscrapers.

Pre-K - Higher Ed
Clouds hover over New York City skyscrapers.
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Skyscrapers surround the sky in New York City.

Pre-K - Higher Ed
Skyscrapers surround the sky in New York City.
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The sun sets over the Alaskan tundra.

Pre-K - Higher Ed
The sun sets over the Alaskan tundra.
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A musher leads a team of sled dogs over an icy landscape.

Pre-K - Higher Ed
A musher leads a team of sled dogs over an icy landscape.
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A radar antenna spins atop a tower.

Pre-K - Higher Ed
A radar antenna spins atop a tower.
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A series of sharp-edged ridges characterize the snowy Wasatch Mountains.

Pre-K - Higher Ed
A series of sharp-edged ridges characterize the snowy Wasatch Mountains.
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Flood waters flow past mangroves.

Pre-K - Higher Ed
Flood waters flow past mangroves.
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Snow covers a vast, desolate tundra.

Pre-K - Higher Ed
Snow covers a vast, desolate tundra.
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Rainwater drains into a grate filled with litter on a New York City street.

Pre-K - Higher Ed
Rainwater drains into a grate filled with litter on a New York City street.
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The wet pavement of a garbage truck lot reflects the flashing lights of a garbage truck in New York City.

Pre-K - Higher Ed
The wet pavement of a garbage truck lot reflects the flashing lights of a garbage truck in New York City.
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A small red boat lists on ocean waves.

Pre-K - Higher Ed
A small red boat lists on ocean waves.
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Skyscrapers tower toward the sky in New York City.

Pre-K - Higher Ed
Skyscrapers tower toward the sky in New York City.
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Skyscrapers tower in New York City.

Pre-K - Higher Ed
Skyscrapers tower in New York City.
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Clouds drift over snow-covered glacial peaks.

Pre-K - Higher Ed
Clouds drift over snow-covered glacial peaks.
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Shadows creep along a canyon wall.

Pre-K - Higher Ed
Shadows creep along a canyon wall.
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Getty Images

A breeze rustles a wind sock.

Pre-K - Higher Ed
A breeze rustles a wind sock.
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Leafy trees frame the London Eye Ferris wheel in London.

Pre-K - Higher Ed
Leafy trees frame the London Eye Ferris wheel in London.