What is a volcano?

1.

What is a volcano?
A volcano is an opening in the
Earth's surface through which
lava, A volcano is an opening in
the Earth's surface through which
lava, volcanic ash, and gases.
Currently there are about 1,500
potentially active volcanoes worldwide.
169 of these are in the United States.

2.

How does a volcano form?
Deep beneath the earth is a layer of magma. It puts pressure on the
Earth's crust from below. The Earth cannot always withstand it and
therefore a crack in the Earth's crust is formed.
Then the magma rises up and flows
out. On the surface of the earth, it
hardens and turns into lava

3.

Krakatoa volcano is one of the most powerful volcanoes on the planet
In late August 1883, a massive
eruption was recorded,
destroying almost the entire
island
The explosion generated a catastrophic
tsunami and the shockwave circled the
planet several times.

4.

comparing Krakatoa to the King Bomb.