Convection Currents

Which picture shows material that is more dense?

• The picture of the left

• The picture on the right

What causes convection current in the Earth?

• The uneven heating on each layer inside the Earth.

• The crusts outer layer.

• The temperatures we feel outside.

Can convection currents occur in a solid?

• No.

  just in a liquid and gas.

• Yes.

  In a solid, liquid, and gas.

What is an example of a convection current?

• Touching a hot spoon that was in a soup bowl.

• Feeling the suns rays on a nice summer day.

• Touching an iron skillet after cooking and feeling the heat.

• Movement of gas in a hot air balloon.

Which type of material rises?

• Material that is more dense

• Material that is less dense

• The density does not determine if particles will rise or fall

Heat transfer by convection is caused by differences in what two things:

• Thickness and material

• Weight and electricity

• Temperature and density

Mountains form from....

• Tectonic plates sliding past one another
• Collision of tectonic plates
• Tectonic plates moving away from each other
• Tectonic plates disappearing

Plate movement is caused by _____

• The rotation of the Earth
• Ocean tides
• Convection currents in the mantle
• The moon's gravity

This is the driving force behind the movement of tectonic plates.

• Mantle convection currents
• Oceanic convection currents
• Atmospheric convection currents
• Solar convection currents

As you approach the center of the earth what happens to the temperature, pressure , and density.

• They all increase
• They all decrease
• They remain the same
• They disappear