Why do scientists divide Earth's core into and outer core and inner core? Group of answer choices

They exist in different states of matter.

They have a different chemical composition.

They were formed in different geological eras.

They are divided by a layer of partly molten material called the mesosphere.

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

Which type of respiration takes place when there is no oxygen present

What material did the moon come from?