Sedimentary rocks are formed when soil, rocks, or the remains of dead organisms undergo layering and compaction over a long period of time. the mass of the sedimentary rock is equal to the mass of the a) the soil and rock parts.
b) organic materials in the rock.
c) inorganic materials in the rock.
d) the original items making the rock

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.