Show:
Earth's Crust Part 1
Earth's Crust Part 2
Earthquakes
Volcanoes
Miscellaneous
100
How many layers of earth are there?
3
100
Melted rock below earth's surface is called ____________.
magma
100
Most earthquakes are too weak to feel. They can only be detected by instruments called _____________.
seismographs
100
Lava hardens into solid rock. Over time, this rock can build up and form a mountain called a ________.
volcano
100
A rapid movement of rock, soil, and other material down a hill or mountain is called a ____________.
landslide
200
Earth's crust and upper mantle form a rocky shell that is broken into parts called ____________.
plates
200
Melted rock that flows from a volcano onto Earth's surface is called ________.
lava
200
Scientists measure earthquakes using the _______________ scale.
moment magnitude
200
How many types of volcanoes did we study?
3
200
Name the force that pulls landslide material downhill.
gravity
300
How many plates are there?
20
300
How do mountains form?
Mountains form when plates push against each other.
300
Earthquakes with a low magnitude releases ___________.
little energy
300
Hawaii has many volcanoes. The islands are always growing. Describe how a volcano could help an island grow, or gain more land area.
The lava that flows from volcanoes cools as it enters the ocean. This lava builds up over time and creates new land.
400
A crack in Earth's crust where plates can slip past, move away from, or push against each other is called a _______ .
fault
400
Name 3 ways plates can move.
Plates can slip past each other, move toward each other, or push away from each other.
400
Describe how the movement of plates cause an earthquake.
As plates slip past each other, a part of a plate can get stuck. Pressure builds, and when the plates break free the energy creates an earthquake.
400
Name 3 types of volcanoes.
cinder cone, shield, composite
500
Name the 3 layers of earth.
crust, mantle, core
500
Describe what happens to plates under areas where volcanoes form.
One plate slides underneath another plate.
500
Name 3 ways a strong earthquake can cause damage:
Buildings can fall, bridges can collapse, railroads can twist, rivers can change course, the land can be raised and lowered.
500
What is the difference between magma and lava?
Magma is melted rock below earth's surface. Lava is melted rock that has come above earth's surface.