Exercise 1

Full name:

When did Mexican farmer Dionisio Pulido hear a loud noise?

• February of 1942
• January of 1942
• February of 1941

Did the sound come from the sky?

• Yes, it did
• No, it didn't

How far would its lava and ash cover?

• over 202 square km.
• over 200 square km
• over 220 square km.

Where does the resulting magma typically remain?

• under the ocean
• on the Earth’s surface
• under the Earth’s surface

How many geological factors are mentioned?

• two
• three
• four

What is the second geological factor mentioned, lithostatic pressure or magmastatic pressure?

What is strong enough and heavy enough to keep the magma in place?

One of the most common causes of an eruption is an .............. in magmastatic pressure.

What can remove massive quantities of rock from atop a magma chamber?