science 12/8

Convection can take place in _________________.

• solids only

• liquids only

• liquids and gases only

• solids, liquids and gases

During convection, more dense currents _________ and less dense currents _________.

• sink, rise
• rise, sink

Where does the initial source of energy come from that creates winds?

• the moon
• the sun
• the Earth's surface
• the rotation of the Earth

Less dense air will

• rise

• sink

• have equalibrium

Cold air sinks because...

• It is less dense
• It is more dense

The molecules in the air are ________ when the temperature is hot.

• moving rapidly and are spread apart
• moving slowly and are close together
• not moving
• there are no air molecules

Land heats up and cools down faster than water.

• True
• False

The way the heat is moving from the hot coffee is called...

• convection
• radiation
• insulation
• conduction

Walking on the warm sand sand with your bare feet demonstrates this type of heat transfer. 

• conduction
• convection
• radiation

A group of friends gather around a fire to stay warm.

• conduction
• convection
• radiation