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SS - Chapter 7 Lesson 4 - What causes rapid changes to landforms?

Terms in this set (24)

landslide
The rapid downhill movement of a large amount of rock and soil.
The force of gravity pulls objects from higher places to lower places
True
Freezing and thawing can loosen rock
True
Landslides can cause a lot of damage to buildings, cars, trees, and roads
True
volcano
A cone-shaped landform that forms at the weak spot in Earth's crust where magma reaches the surface.
Magma flowing frm a volcano is called lava
Lava is still very hot perhaps 2,000 degrees (F)
What is the name of lava when it's still inside the Earth's surface?
Magma or molten rock
Hot rocks, gases, and ashes are forced out of the volcano's openings, called
vents
All volcanic eruptions are violent.
False. The type of eruption depends on the temperature and the kind of magma
A vocalno that has not erupted for a long time is said to be
Dormant. For example, Mount Lassen, California
A volcano is extinct if scientists do not think it will erupt again
True (For example, Mount Kenya in Africa)
An active volcano has frequent eruptions or show signs of future eruptions
True (For example, Mount Kilauea, Hawaii)
When a volcano erupts, the land around it can change rapidly
A bowl-shaped area, or crater, may form around the main vent. The lava and ash can spread over a wide area
fault
A break or crack in rocks where Earth's crust can move.
earthquake
The sudden movement that causes Earth's crust to shake.
Most earthquakes and volcanoes are along or near the places where Earth's plates meet
True
Earthquakes can cause major, rapid changes to Earth's surface
True
The vibrations of ean earthquake move as waves travel through Earth.
Waves move up and down, and back and forth. These waves can cause cracks in Earth's surface
Earthquake cause more damage near a town with many buidings than it would in a remote area
True
Many towns in California are built along a huge fault system named
San Andreas Fault
San Andreas Fault runs
north to south through much of California
Many earthquakes happen near the fault
True
Most earthquakes are small. A few earthquakes are powerful enough to damage buildings, roads and bridges
True
Earthquakes can cause landslides on the ocean floor or land
True
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