According to the video, ________________is essential to life on earth.

Nitrogen is necessary for both plants and _____________ to live and grow.

Nitrogen is needed for our bodies to make ___________. Therefore, nitrogen is called the “building blocks of life”.

Nitrogen makes up around _____________of the air around us.

Plants and animals can or can not use nitrogen directly from the air.

Plants receive needed nitrogen from the ___________.

Animals get their needed nitrogen from ___________the plants that contain the nitrogen.

The process for turning the nitrogen in the atmosphere into a usable form of nitrogen is called_____________.

The legume family, such as beans, peas and clover, ____________the process using their root nodules to absorb nitrogen.

Another way to get the nitrogen in the soil is by living things_______________ and returning the nitrogen to the soil.

Lightning also helps by producing nitrous oxide to the air and then falling to the ground, in rain, in the form of Nitric Acid.

Fertilizer added to the soil accounts for about 30 percent of nitrogen____________.

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