When did pangaea begin to break apart?
a. 20 million years ago
c. 250 million years ago
b. 100 million years ago
d. 2 billion years ago.

Answer;

250 million years ago

Explanation;

-In early geologic time, Pangea was a supercontinent that incorporated almost all the landmasses on Earth.

Pangea was surrounded by a global ocean called Panthalassa, and it was fully assembled by the Early Permian Epoch.

The supercontinent began to break apart about 200 million years ago, during the Early Jurassic Epoch, eventually forming the modern continents and the Atlantic and Indian oceans.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.