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A mirror-like lake reflects snowy mountains.

Pre-K - Higher Ed
A mirror-like lake reflects snowy mountains.
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Clouds roil above snowy mountain peaks.

Pre-K - Higher Ed
Clouds roil above snowy mountain peaks.
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Fluffy clouds billow across snowy mountain peaks.

Pre-K - Higher Ed
Fluffy clouds billow across snowy mountain peaks.
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Traffic passes between the Treasure Island Hotel and Casino and the Palazzo Casino in Las Vegas, Nevada.

Pre-K - Higher Ed
Traffic passes between the Treasure Island Hotel and Casino and the Palazzo Casino in Las Vegas, Nevada.
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Ocean waves crash against rugged cliffs.

Pre-K - Higher Ed
Ocean waves crash against rugged cliffs.
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A tall dike protects orchards.

Pre-K - Higher Ed
A tall dike protects orchards.
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Traffic flows through an intersection near Treasure Island Hotel and Casino and Mirage Hotel and Casino in Las Vegas, Nevada.

Pre-K - Higher Ed
Traffic flows through an intersection near Treasure Island Hotel and Casino and Mirage Hotel and Casino in Las Vegas, Nevada.
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Ocean waves splash against boulders on a rocky shore.

Pre-K - Higher Ed
Ocean waves splash against boulders on a rocky shore.
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A swimmer bobs as waves splash against boulders.

Pre-K - Higher Ed
A swimmer bobs as waves splash against boulders.
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Large rock formations make up portions of the Baja Desert.

Pre-K - Higher Ed
Large rock formations make up portions of the Baja Desert.
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Cirrus clouds streak the sky over the dry mountains of Mexico's Baja California Desert.

Pre-K - Higher Ed
Cirrus clouds streak the sky over the dry mountains of Mexico's Baja California Desert.
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Shadows quiver over rock formations in the Baja Desert.

Pre-K - Higher Ed
Shadows quiver over rock formations in the Baja Desert.
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Shadows creep across rock formations in the Baja Desert.

Pre-K - Higher Ed
Shadows creep across rock formations in the Baja Desert.
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Desert shrubs dot the Baja California Desert in Mexico.

Pre-K - Higher Ed
Desert shrubs dot the Baja California Desert in Mexico.
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Time-Lapse shot of Horseshoe Bend in the Colorado River

Pre-K - Higher Ed
Time-Lapse shot of Horseshoe Bend in the Colorado River
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Karst area of the sunset,Guilin,China

Pre-K - Higher Ed
Karst area of the sunset,Guilin,China
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Traveler with backpack walking in mountains

Pre-K - Higher Ed
Traveler with backpack walking in mountains
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Clouds hang over Cape Peninsula.

Pre-K - Higher Ed
Clouds hang over Cape Peninsula.
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A river winds past huge black boulders where the Angel Falls crash over a cliff.

Pre-K - Higher Ed
A river winds past huge black boulders where the Angel Falls crash over a cliff.
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Storm clouds loom over terraced hills at the Funchun Resort in Shanghai, China.

Pre-K - Higher Ed
Storm clouds loom over terraced hills at the Funchun Resort in Shanghai, China.
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Traveler with backpack walking in mountains

Pre-K - Higher Ed
Traveler with backpack walking in mountains
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Getty Images

Karst area of the sunset.

Pre-K - Higher Ed
Karst area of the sunset.
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Getty Images

Morning mist Ha long Bay limestone karsts Unesco region North Vietnam

Pre-K - Higher Ed
Morning mist Ha long Bay limestone karsts Unesco region North Vietnam
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Clouds drift above snowy mountains and a forested valley in Alaska.

Pre-K - Higher Ed
Clouds drift above snowy mountains and a forested valley in Alaska.