Sedimentary rock indicates the current or past existence of
water
lava
plants and animals
carbon dioxide


choose all the answers that apply.

the crust is:
the thinnest layer
made of large pieces called plates
mostly made of silicon dioxide
the outermost layer of the earth
also called the hydrosphere


the ozone layer
is part of the troposphere
is used to send radio signals
protects the earth from uv radiation
is made of charged ions and free electrons