HELP ME i gotta catch up on missing work and cant leave the kitchen table until i do, and my back is starting to hurt

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

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.