Use the drop-down menus to complete each sentence about the layers of the atmosphere. If the
✔ mesosphere
did not exist, Earth might be destroyed by chunks of rock from space.

The
✔ stratosphere
is located 12 to 50 kilometers from Earth’s surface.

Both the
✔ mesosphere and troposphere
get colder as altitude increases.

The ozone in the
✔ stratosphere
protects people from ultraviolet (UV) radiation.

The
✔ thermosphere
has the highest temperature of any layer in Earth’s atmosphere.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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