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What causes Earth's plates to move?
Gravity
Which landform can be formed when a volcano underwater reaches the surface of water?
A volcanic island. All Hawaiian islands were formed this way.
Which landform can be formed from lava flowing from a surface opening?
A volcano. It is a mountain made of lava, ash and other materials from eruptions.
When magma reaches Earth surface, how is it called?
Lava
Molten rock beneath Earth's surface that forms in boundaries is called
Magma
What is a tsunami?
It is a large ocean wave caused by an earthquake or volcanic eruption underwater.
Earthquakes are usually destructive forces, but they may be constructive as well. Which landforms can they form?
Mountains and lakes
What measures the Richter scale?
The amount of energy released. It goes from 1 to 10.
Which plates movements may cause an earthquake?
Plates pushing together, plates sliding each other or plates pulling apart.
Place on Earth's SURFACE directly above focus is called
Epicenter
Place INSIDE Earth where energy is released first, starting an earthquake.
Focus
A shaking of Earth's surface caused by sudden release of energy in Earth's crust.
Earthquake
What are divergent boundaries?
When 2 plates move away from each other and the lithosphere breaks apart. The space sinks and forms a valley.
How are islands form?
When convergent ocean plates meet.
What are convergent boundaries?
When 2 plates come together and push against each other. One is forced upward and the other downward, causing mountains and volcanoes to form.
What can occur at plates boundaries?
Earthquakes occur, volcanoes erupt or mountains form.
The place where two plates meet is called
Boundary
The plates under continents are called
Continental plates
The plates under the ocean are called
Oceanic plates
What is the name of the sections or blocks that conform the lithosphere?
Plates
Earth has 4 layers: crust, mantle, outer core, inner core. Which ones form the lithosphere?
Mantle and outer core