Earthquakes
Describe an earthquake that is a level 5 on the Richter scale.
Felt over a wider area. Usually lots of damage to weak buildings around the center.
When magma reaches the surface, what happens?
It cools into solid rock, often forming a mountain or island
As high as a football field is long.
What is an earthquake?
the shaking of Earth's crust caused by underground vibrations
What do we use to measure the strength of earthquakes?
on an instrument called a seismograph
What happens if a piece of rock plugs up the crack or hole in a volcano?
The pressure grows and suddenly the volcano explodes.
What happens as tsunami's come close to land?
the rising ocean floor pushs the wave upward; it is tall enough to destroy almost anything in its path.
What is a fault?
cracks in Earth's crust along which movement occurs
What are some results of a strong earthquake?
buildings crumble, bridges collapse, and large cracks open in the ground.
In 1991, what did scientists do in the country of the Philippines do?
They warned people that a volcano was about to erupt and many people left.
True or false: Even a small tsunami can destroy houses, streets, and entire towns
true
What is magma
melted, liquid rock beneath Earth's surface
Why does an earthquake happen?
Sometimes the plates get caught on eachother and cannot move. The pressure and energy build up.
These are falling rocks that happen when mountains explode.
landslides
True or false: Tsumamis are becoming harder to predict.
false
What is a mudslide?
a dirt and debris-filled flood of water.