Why do you need to learn about Volcanoes?

Without volcanoes, most of Earth's water would still be trapped in the crust and mantle . Early volcanic eruptions led to the Earth's second atmosphere, which led to Earth's modern atmosphere . Besides water and air, volcanoes are responsible for land, another necessity for many life forms .

Explanation:

that would be because of both gravity and friction. so     c

80cm/s.

24cm/s.

53.3cm/s.