Agroup of stars, gas, and dust held together by gravity is a
a.
galaxy
c.
local group
b.
constellation
d.
both a and b

Explain how ancient whale fossils found in eqypt are believed to support the theory of evolution.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Long term exposure to waves can cause sunburns and skin cancer.