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Sometimes all of one type of animal die, and that animal never comes back. We say the animal is "extinct". Many times in the past, animals have gone extinct over and over again, and this is quite natural. However, there have been times of mass extinctions, when huge numbers of animals all went extinct at once. Here are 10 mass extinctions, which will also walk you through the ancient ages of Earth.

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The ascendancy of land plants is implicated in glaciation episodes.

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Science & Technology

Predator at the Earth’s Biggest
This monster was in the highest food chain in the Cambrian period.

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Science & Technology

Predator at the Earth’s Biggest
This monster was in the highest food chain in the Cambrian period.

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Warning: Nothing cute ahead.

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It’s really easy to get lost in the midst of the words: Eras, Periods, Pre-Cambrian, Paleozoic, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Mesozoic, Triassic, Jurassic (I bet this one you’re familiar with) and Cretaceous especially when reading a geology-based article. Good News! Here’s your chance to get to know the terms.