Sci 8 Convection Currents & Plate Tectonics

Does the solid inner core have convection currents moving inside?

• No.

  Currents only move in a liquid and gas.

• Yes.

  Convection currents move through a solid.

Name the type of heat transfer shown in the picture.

• convection

• conduction

• radiation

Convection cycles move in the mantle. How does this affect the crust?

• crust has no motion

• crust moves in random directions

• crust moves in same direction convection cycle moves

Convection currents occur due to...

• rotation of earth

• differences in temperature and density

• electrons moving

• gravitational pull

Molecules that are less dense than the surrounding particles will...

• rise up
• sink down
• stay put

Molecules that are more dense than the surrounding particles will...

• rise up
• sink down
• stay put

When molten  material is heated in the mantle the molecules

• expand (spread out)
• condense (shrink together) 
• stay the same

When molten  material is cooled in the mantle it becomes

• more dense
• less dense 

Where do convection cycles happen?

• core

• mantle

• crust

____ are circular motions in the Earth's mantle caused by the rising and falling of mantle material that is undergoing changes in temperature and density.

• convection currents

• asthenosphere

• crustal movements

• mesosphere