Water: the strangest chemical in the universe ✔

Water makes up what percentage of the surface of the Earth?

• 7%

• 90%

• 70%

• 30%

Liquid water becomes (more/less) dense when it freezes into solid ice.

• less

• more

Other than water, most substances in their solid phase are more dense than their liquid phase.

• False

• True

The fact that ice floats means that it insulates the water below it, 

• and allows life to exist in water bodies even when the earth's temperature gets really cold.

• which keeps water bodies cold so that life cannot penetrate it. 

Early in the Earth's history, minerals and heat spewed up into the oceans which mixed with the water and created the basis for

• chemistry.

• waves.

• life.

• rocks.

What is water moving around in you and every living thing? (Select all that apply)

• nutrients

• energy

• solar

• soil

Billions of years ago, comets brought water to the Earth.

• False

• True

What are the other classical elements? (select all that apply)

• earth

• hydrogen

• fire

• air

Water has been found on the moon and mars.

• False

• True