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Sea

what is amber
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What Is Amber?

Amber is the fossil resin of ancient pine trees. On hot, prehistoric days, sticky pine resin oozed from trees and hardened in the air fillin

why does the ocean look blue
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Why Does the Ocean Look Blue?

Why Does the Ocean Look Blue? The ocean usually appears to be blue. However, sea water, as anyone knows who has splashed about in the surf,

what is chalk
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What Is Chalk?

Chalk is a soft, white limestone. The chemical composition is calcium carbonate with minor amounts of silt and clay. It was formed from the