Interesting Geology
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The Plate Tectonics
Imagine the Earth’s outer shell is like a cracked eggshell. The pieces of shell, called tectonic plates, are slowly moving, about as fast as your fingernails grow. When these pieces bump into, pull away from, or slide past each other, they cause earthquakes, volcanoes, and build mountains. The theory says that Earth’s outer layer is…
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The Cambrian Explosion
The Cambrian Explosion refers to a relatively short period in geologic time (around 541–530 million years ago) during which most major animal phyla (body plans) suddenly appeared in the fossil record.
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