Water also comes from plant leaves to the atmosphere through ________________.

When the water cools down in the atmosphere, the water goes through _______________ and becomes clouds.

The water doesn’t stay there! It comes back down to earth as _______________ through rain, sleet, or snow!

Which of the following are forms of precipitation? (Select all correct answers)

What type of organism “fixes” the nitrogen for use by plants?

Humans and other animals breathe in __________ and release carbon dioxide

Plants absorb ________________________ and release oxygen

Which of the following release carbon into the atmosphere? (Select all correct answers)

CO2 is another way to write ___________________

N (or N2) is another way to write ____________

O (or O2) is another way to write

H20 is another way to write ___________. It stands for 2 hydrogen atoms and 1 oxygen atom.

Fossil fuels are removed from _______________ and then burned as fuel for cars, planes, and other machines

Fossil fuels are considered _____________________ resources because they take MILLIONS of years to make, and are NOT easily replaceable once they've been burned as fuel.

TRUE OR FALSE: Nitrogen is an important material for living things.