Earth History/Geological Time Quizizz

The oldest rock layer in an undisturbed rock sequence occurs ____.

• at the bottom of the sequence

• below the sedimentary rock layer

• below the unconformity

The amount of time it takes for one-half of the original amount of an isotope to decay is known as its ____.

• correlation

• half-life

• period

Evolution is the process by which organisms ____.

• reproduce

• digest and grind their food

• adapt to changes in their environments

Which correctly orders units of geologic time, from most general to most specific?

• eon, era, period, epoch

• era, epoch, eon, period

• epoch, eon, period, era

What is the correct label for “C” on the diagram?

• Paleogene

• Paleozoic

• Permian

The principle of superposition can be used to determine .

• the actual age of these rock layers

• the relative densities of these rock layers

• the relative age of these rock layers

What classification of unconformity occurs when sedimentary rock overlies igneous rock?

• conformity

• disconformity

• nonconformity

A rapid appearance of many new species of organism’s usually________.

• happens after a mass extinction

• is directly related to a drop in sea level

• happens just before an extinction event

When there is no tectonic activity along the edge of a continent, the edge is referred to as a ____.

• transgression

• passive margin

• regression

During the ____, all but one of the major marine phyla appeared.

• Antler Orogeny

• Caledonian Orogeny

• Cambrian explosion