5 science Fossil Record Ch 4

On the Geologic Time Scale, eras are divided into

• periods

• indexes

• relative dates

• epochs

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NGSS.MS-ESS1-4

Most fossils form when organisms die and are buried in

• ice

• faults

• sediment

• unconformities

Magma that forces its way into rocks and hardens is called a(n)

• extrusion

• unconformity

• fault

• intrusion

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The earliest forms of life appeared during

• the Paleozoic Era

• the Cenozoic Era

• Precambrian Time

• the Mesozoic Era

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A petrified fossil forms when

• minerals seep into the empty space of a mold

• minerals replace all or part of an organism

• an organism becomes trapped in amber

• the weight of sediment squeezes everything away except carbon

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NGSS.MS-LS4-1

Fossils provide evidence for all of the following EXCEPT for

• how Earth originally formed

• how groups of organisms have changed over time

• changes in Earth's surface

• how environments have changed over time

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In the Cambrian Explosion,

• mammals spread into every environment on Earth

• the supercontinent broke apart

• a great number of different organisms evolved

• an asteroid collided with Earth

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The Mesozoic Era is often called the

• Age of Fish

• Age of Amphibians

• Age of Mammals

• Age of Reptiles

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Scientists use radioactive dating to

• find trace fossils in igneous rock

• determine the absolute age of rocks

• determine the relative ages of extrusions

• discover the source of index fossils

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Reptiles evolved from

• amphibians

• dinosaurs

• mammals

• birds

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