QUESTION 5 Go to the following Geotours Folder in Google Earth: 2. Exploring Geo

Question

QUESTION 5

Go to the following Geotours Folder in Google Earth: 2. Exploring Geology Using Google Earth ? Geotour Worksheets ? I. Geologic Structures. Faults are typically classified in one of three main categories: normal, reverse and strike-slip. The following questions will take you to locales that provide examples of these faults.

Check and double-click the placemarks for Problems 3a-i,-ii, and –iii to fly to Canyonlands National Park-Needles District in Utah. The area is a region in the Grabens area that is experiencing normal faulting as the rock units in the region are extending to the west. It is called the Grabens because the faulting forms fault-bounded blocks that have been down-dropped (grabens) with intervening high blocks (horsts). Which of the following is the best answer for identifying the structures in the view?

3a-ii: horst

3a-i: horst, 3a-ii: graben

3a-i: graben

3a-i and 3a-ii: grabens

3a-ii: horst

3a-i: horst, 3a-ii: graben

3a-i: graben

3a-i and 3a-ii: grabens

Explanation / Answer

This is the relevant answer 3a-i and 3a-ii: grabens because in this region some facts supports the above mentioned reason:

Presence of group of parallel valleys in this region and their cutting across the rust-colored existing surface of Colorado river.

Presence of numrous grabens as sinking blocks of rocks between the parallel faults there,here they are grabens are 25 to 75 meters and even extend for some 25 kilometers.

Subsidence of he oceanic plates in the Pacific underneath North America plate that has , pushed the Colorado Plateau upward.This phenomena has given birth to network of cracks that has with the time become the walls of the grabens existing in this zone.

The sinking blocks that has given rise to grabens has also forced and pushed the adjacent rock upward, creating the elevated features known as horsts.

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