which of these is a characteristic of an index fossil found in the topmost layer found in many layers of the same Rock have already established relative age or limited to particular geographic location

In a floral arrangement, the focal area is often

Which of these best describes an ionic bond?

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils