Question

how did the formation of the ozone layer contribute to the existence of life on earth?
it blocked the suns harmful uv rays.
it caused water vapor to cool, condense, and collect.
it released large amounts of oxygen into the air.
it warmed earths surface, preventing materials from freezing

Explanation:

The ozone layer is a region of Earth's stratosphere that contains a high concentration of ozone (\(O_3\)). Ultraviolet (UV) rays from the Sun can be harmful to living organisms, causing damage to DNA, skin cancer, and harming plants. The ozone layer absorbs most of the Sun's harmful UV radiation.

• The option "It caused water vapor to cool, condense, and collect" is related to the water cycle processes like condensation and has no direct relation to the ozone layer's main function.
• The option "It released large amounts of oxygen into the air" is incorrect as the ozone layer is made of \(O_3\) (not a source of \(O_2\) release in the way implied here; photosynthesis by plants is a major source of \(O_2\) release).
• The option "It warmed Earth's surface, preventing materials from freezing" is more related to the greenhouse effect (caused by gases like \(CO_2\), \(CH_4\) etc.) rather than the ozone layer's role.

Answer:

It blocked the Sun's harmful UV rays.