Question

which of these answers describes earths atmosphere?
the mixture of gasses that surrounds the earth.
all the fresh and salt water on the earths surface.
all living and once living things.
the mixture of nickle and iron below the earths surface.

Explanation:

The Earth's atmosphere is a layer of gases that surrounds the planet. It is composed mainly of nitrogen, oxygen, and smaller amounts of other gases. The first option correctly describes it as a mixture of gases surrounding the Earth. The second option refers to the hydrosphere (water on Earth's surface). The third option refers to the biosphere (living things). The fourth option refers to the composition of the Earth's core (nickel - iron mixture).

Answer:

The mixture of gasses that surrounds the earth.