OUR UNIVERSE. (How we are much tinier and younger than we Earthlings think.). THE BIG BANG. About 14 billion years ago the entire universe was contained in a bubble that was smaller than a period. . (like this, and this is a screen period, a pencil period is even smaller)
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(How we are much tinier and younger than we Earthlings think.)
When they crash against one another one plate sinks into the molten lava. The other plate is raised up.
These collisions can make mountains, volcanoes.
These collisions form earthquakes.