Cross Sections

Analyze the seashell found in the white (middle) layer.  Which statement is true of the rock layer that contains this fossil?

• It could also contain a fossil from the bottom layer.

• It is older than the layers below it.

• It is younger than the layers above it.

• It is older than the layers above it.

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

According to the law of superposition, which layer is the youngest?

• A

• B

• C

Tags

NGSS.MS-ESS1-4

Which of the following is the oldest?

• Layer L

• Intrusion D

• Intrusion H

• Layer E

Tags

NGSS.MS-ESS1-4

Letter "F" is a....

• inclusion

• intrusion

• fault

• unconformity 

Tags

NGSS.MS-ESS1-4

Which feature would likely indicate the presence of an ancient river system in a geological cross-section?

• Uniform rock layers

• Cross-bedding patterns

• A syncline

• A vertical fault

Tags

NGSS.MS-ESS2-3

What does a syncline represent in a geological cross-section?

• A fold with the youngest layers at the center

• A fold with the oldest layers at the center

• A vertical fault line

• An area of no geological activity

In a geological cross-section, what do inclined layers indicate?

• The presence of water bodies

• Horizontal sediment deposition

• Tectonic plate movement

• The angle of past sedimentary layer deposition

Tags

NGSS.HS-ESS1-5

When interpreting a cross-section, what does a vertical exaggeration indicate?

• The actual depth of rock layers

• The difference in elevation between two points

• An intentional distortion to emphasize vertical features

• The scale used for horizontal distances

What is the primary purpose of a geological cross-section?

• To show the distribution of plants and animals in an area

• To display the surface features of a region

• To illustrate the types and positions of rocks beneath the Earth's surface

• To map the weather patterns over a geological time period

Tags

NGSS.MS-ESS2-3

What does the presence of an unconformity in a geological cross-section suggest?

• Continuous sediment deposition

• An area with no tectonic activity

• A period of erosion or non-deposition between two sediment layers

• The presence of a large body of water