Label the parts of a wave:

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

What was the land like over 500 million years ago? what was under the sea?

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