Geologic Time Test Study Guide

The geologic time scale enables scientists to find relationships among which things?

• Rocks and fossils

• Planets and stars

• Animals and plants

• Oceans and rivers

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The three earliest eons, which make up 90% of geologic time are informally called the?

• Hadean, Archean, and Proterozoic

• Paleozoic, Mesozoic, and Cenozoic

• Cambrian, Ordovician, and Silurian

• Triassic, Jurassic, and Cretaceous

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Geologic time units are defined by:

• the age of rocks and fossils

• the position of stars

• the weather patterns

• the ocean currents

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An event during which many groups of organisms disappear from the rock record at about the same time is called?

• Mass extinction

• Evolution

• Speciation

• Adaptation

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NGSS.MS-LS4-1

What is relative age dating?

• A method to determine the exact age of a rock or fossil

• A technique to arrange geological events in a sequence

• A process to find the age of the Earth

• A way to date fossils using radiometric techniques

A gap in the rock record caused by weathering and erosion is called:

• Unconformity

• Sedimentary layer

• Fossil record

• Metamorphic zone

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NGSS.MS-ESS1-4

Unconformities, disconformity, nonconformity, and angular unconformity are types of what?

• Geological formations

• Weather patterns

• Biological classifications

• Chemical reactions

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____ age dating gives the numerical age of rocks and other objects while ____ age dating compares past geological events based on the order of strata in the rock record.

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What do scientists learn when they measure the ratio of parent isotope to daughter product in a mineral?

• The age of the mineral

• The chemical composition of the mineral

• The temperature at which the mineral formed

• The location where the mineral was found

Outgassing by volcanoes today releases materials that are very different from those that formed Earth's earliest atmosphere.

• True

• False