Earth Science Unit 4 Rocks Review

Letters A through J represent rock units. An unconformity is shown at letter X. A fault is shown at letter Y. Which process occurred most recently?

• formation of fault Y

• development of unconformity X

• formation of intrusion H

• deposition of rock layers D, E, F

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

Layers of volcanic ash often serve as useful geologic time markers because ash layers usually

• deposit quickly over a wide area

• are older than the surrounding rock

• can be sampled easily

• darken with age

Tags

NGSS.MS-ESS1-4

Letters A through D represent landscape features, and numbers 1 through 7 represent rock layers. The detail shows a fossil found in layer 3. What is the correct sequence of events from oldest to most recent in the geologic history of this area?

• deposition of layers from 1-7 -> intrusion of basalt -> faulting

• deposition of layers from 1-7 -> faulting -> intrusion of basalt

• deposition of layers from 7-1 -> intrusion of basalt -> faulting

• deposition of layers from 7-1 -> faulting -> intrusion of basalt

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

Overturning has not occurred, the dike and sills shown in the cross section are igneous rock intrusions. Which rock type is the oldest?

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Tags

NGSS.MS-ESS1-4

The diagram shows a geologic cross section. Letters A through D represent different rock units. Which sequence correctly shows the age of the lettered rock units, from oldest to youngest?

• A -> B -> C -> D

• C -> D -> A -> B

• D -> B -> A -> C

• D -> C -> B -> A

Tags

NGSS.MS-ESS1-4

In the geologic cross section, overturning has not occurred. Letters A through H represent rock layers. Which two letters represent bedrock of the same age?

• A and E

• B and D

• F and G

• D and H

Tags

NGSS.MS-ESS1-4

The cross section represents four different rock units. The symbol for contact metamorphism has been omitted from the cross section. Which cross section below represents where the symbol for contact metamorphism would be located, based on the relative age sequence?

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Tags

NGSS.MS-ESS1-4

The sequence of rock types found in the walls of the Grand Canyon are shown. The names of rock formations are shown and the upper and lower boundaries of each formation are indicated by dashed lines. The rock layers have not been overturned. The sequence of rock layers in the cross section provides evidence that the Muave formation is

• younger than the Temple Butte, but older than the Bright Angel

• younger than both the Temple Butte and the Bright Angel

• older than the Temple Butte, but younger than the Bright Angel

• older than both the Temple Butte and the Bright Angel

Tags

NGSS.MS-ESS1-4

The geologic cross section of the Grand Canyon shows numbers 1-10 that represent Paleozoic sedimentary rock layers. The unconformity between the Paleozoic sedimentary rocks and the Precambrian sedimentary rocks represents

• a gap in geologic time record

• an intrusion of igneous rock

• an abundance of fossils

• a region of metamorphic rock

Tags

NGSS.MS-ESS1-4

The three geologic columns represent the rock layers in outcrops located several miles apart. The rock layers have not been overturned. Two different index fossils are shown. Of the rock layers found in these three outcrops, which layer was probably formed most recently?

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Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3