Plate tectonics- 6th

This layer of Earth is the thickest.

• crust
• outer core
• mantle
• inner core

The layer that makes up most of the earth's mass and volume is the

• crust
• mantle
• core
• asthenosphere

Which of the following occurs because of convection currents?

• Tectonic plates on the crust move.
• The mantle increases in size.
• Pressure in the crust increases.
• Pressure in the crust decreases.

Scientists think that convection currents that move the plates flow in Earth's

• Continental crust only
• Oceanic crust only
• Asthenosphere
• Lithosphere

The mantle of Earth is made partly of magma. When magma rises and sinks due to temperature differences, this is called ______________. 

• conduction currents
• a hot spot
• a volcanic eruption
• convection currents

Which is a correct order of the layers from the surface to inside the Earth? 

• inner core, lithosphere, mesosphere, outer core, asthenosphere
• asthenosphere, lithosphere, mesosphere, outer core, inner core
• lithosphere, asthenosphere, mesosphere, outer core, inner core
• crust, core, mantle

As you travel from the crust to the inner core, how would temperature, pressure, and density of the material change?

• They would all increase.
• They would all decrease.
• They would stay the same.  
• Temperature would decrease, but pressure and density would increase. 

The physical outer layer of Earth made of solid rock and soil is called the ___________. 

• core
• lithosphere
• asthenosphere
• mesosphere

Where does the heat come from that drives convection currents in the mantle? 

• The sun
• The crust
• the mantle
• the core

Which liquid is the least dense?  Use the picture to help you answer the question.  

• oil
• water
• syrup 
• plastic bottle