Changes to the biosphere were most common 3.5 billion years ago.
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Q35: A fault would be a cross-cutting feature.
Q36: Rocks at the bottom of a sequence
Q37: The frequently found progression from sandstone to
Q38: Cinder cones are typically the last formation
Q39: Fossils are the key to matching rocks
Q41: Periods are the longest time spans on
Q42: Fossils became common starting with the Cambrian.
Q43: Atmospheric oxygen greatly increased during the Cambrian.
Q44: Paleontologists have examined the fossil record to
Q45: Humans have existed on Earth longer than
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