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Chapter 12 Lesson 1

Across
The _ is the atmospheric layer farthest from Earth.
Earth is protected from most _ collisions by the mesosphere and thermosphere.
The oxygen in Earth's atmosphere is a product of _
_ in the stratosphere absorbs harmful ultraviolet rays from the Sun.
Water Vapor in the troposphere plays a key role in Earth's _.
Down
Air pressure _ with altitude, so it is harder to breathe at the top of a mountain
__occur(s) when ions from the Sun strike air molecules.
The air - at the top of Mount Everest is lower than the _ at its base.
This layer helps to protect Earth from Meteorites.
_ gas is the most abundant gas in Earth's atmosphere