Mod F, Unit 1, Lesson 3: Earths Plates

Tectonic plates are the large moving pieces of Earth’s surface.

• True

• Flase

Tectonic plates move because of

• electric currents
• current events
• convection currents
• global climate change

What is convection?

• All of the mantle is the same temperature throughout.
• The process by which less dense material rises and more dense material sinks.
• More dense material rises to the surface.
• A process that occurs in the inner core of the earth the affects plate tectonics.

What is plate tectonics?

• movement of plates at dinner
• volcanoes and earthquakes
• a product of global climate change
• the movement of the rigid plates around the surface of Earth

Mountains form from ...

• plates sliding past one another
• collision of plates
• plates moving away from each other

Earth's plates are...

• constantly moving and changing the face of the earth
• Never moves
• Moves when it feels like it

Sea-floor spreading begins at the

• Deep ocean trench

• Mid-ocean ridge

• Continent's edge

New crust is always formed at the...

• mid-ocean ridge
• deep-ocean trench
• asthenosphere

Older crust is found towards the...

• Mid-ocean ridge
• Deep-ocean trench
• Asthenosphere

What is the Mid ocean ridge?

• a continental mountain range

• a valley system in the middle of the ocean

• an underwater mountain range