Which is an example of conduction?
A: a metal spoon warming in a pot of hot soup

How do the sprouts of seeds buried in complete dark in the soil find their way to the surface of the soil?
A: They grow opposite the direction of the pull of gravity.

Red-clay bricks have a density of approximately 2000 kg/m^3. Air has a density of 1 kg/m^3. Which of the following has the lowest mass?
A: 2 m^3 of bricks

Which type of water reservoir contains the largest volume of fresh water?
A:
ice sheets