Throwback Thursday! 03/06/25

Part A: Seismologists studying glaciers in Antarctica, Greenland, and Alaska observe that icebergs breaking off from the glaciers can trigger seismic waves. The scientists want to determine whether there is a relationship between the size of the iceberg and the strength of the icequake.

Select three sources of relevant data that would be most useful to the scientists as they attempt to find an answer.

• ice core sample

• satellite images

• seismogram display

• surface melt water levels

• global positioning system (GPS) maps

Part B: Which event might be a result of the seismic activity resulting from the calving of glaciers?

• deposition

• kettle

• moraine

• tsunami

Students build the stream table model shown to observe stream processes and rates of erosion. They place one end of the stream table on blocks to change the slope of the stream. They also change the height of the water source by adding or removing blocks beneath the water source.

Select the boxes to identify whether each change to the model would increase or decrease the amount of erosion.

Groups:

(a) Increase erosion

,

(b) Decrease erosion

• Adding another block below the water source

• Removing a block from beneath the stream table

• Increasing the diameter of the drainage hole

• Planting grass in the sediment

The picture shows changes in a delta over time. Based on the pictures, which reason would most likely be responsible for the changes?

• frequent landslides

• increasing rate of erosion

• sudden tectonic plate movements

• increasing deposition of sediments

Part A: The two satellite images show the changes over time to an area where a river flows into a body of water. The location of a specific change is marked by an arrow.

Select the two constructive geologic processes that caused the change marked by the arrow.

• sedimentation

• delta formation

• tectonic activity

• seafloor spreading

Part B: Which graph supports the response in Part A by correctly comparing the average water velocity measured in meters per second (m/s) of the river to the body of water at the location marked by the arrow?

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Which statement describes how rock characteristics affect rates of weathering?

• Rocks with metamorphic rock weather more quickly than sedimentary

  rocks.

• Rocks with gaps and cracks weather more quickly than rocks with

  smooth surfaces.

• Rocks without minerals weather more quickly than rocks made up of

  many minerals.

• Rocks that are buried deep underground weather more quickly than rocks

  at the surface.

Bryce Canyon National Park in Utah is famous for having many formations called hoodoos. Hoodoos are tall structures made of sedimentary rock. The Hoodoo Formation diagram shows the process that created these unique rock structures.

Select the two main geologic processes that create the hoodoos.

• erosion

• deposition

• weathering

• volcanic activity

• tectonic activity

Which feature does not result from seismic activity?

• faults

• volcanoes

• glacial deposits

• folded rock

Two cars, X and Y, are traveling on a straight road. Passengers in Car X observe

that Car Y appears to remain still. What is the relative movement of the two cars?

• same speed and same direction

• different speeds and same direction

• same speed and opposite directions

• different speeds and opposite directions