Asked by Blaine
Select the statement(s) that accurately support why the Grand Canyon is made of a large number of sedimentary rocks.
The rock formations in the Grand Canyon are formed in observable layers.
The Grand Canyon was formed as a result of erosion and deposition of sediments.
The Grand Canyon is in an area that was covered by water early in its geological history.
The Grand Canyon has an arid, desert-like climate.
The majority of the Grand Canyon was formed from the heat and pressure along tectonic plate boundaries.
All Answers 1
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Correct choices: 1, 2, and 3.
- The rock formations in the Grand Canyon are formed in observable layers. — Sedimentary rocks are deposited in layers (strata), so visible layering supports a sedimentary origin.
- The Grand Canyon was formed as a result of erosion and deposition of sediments. — Deposition of sediments (later lithified into rock) explains the abundance of sedimentary layers; subsequent erosion (mainly by the Colorado River and uplift) carved the canyon and exposed those layers.
- The Grand Canyon is in an area that was covered by water early in its geological history. — Marine and lake environments deposited large amounts of sediment that became the canyon’s sedimentary rocks.
Not correct:
- The Grand Canyon has an arid, desert-like climate. — Climate explains erosion rates and current weathering, not why the rocks are sedimentary.
- The majority of the Grand Canyon was formed from the heat and pressure along tectonic plate boundaries. — Heat and pressure produce metamorphic rocks; they do not account for the extensive sedimentary strata found in the canyon.
- The rock formations in the Grand Canyon are formed in observable layers. — Sedimentary rocks are deposited in layers (strata), so visible layering supports a sedimentary origin.
- The Grand Canyon was formed as a result of erosion and deposition of sediments. — Deposition of sediments (later lithified into rock) explains the abundance of sedimentary layers; subsequent erosion (mainly by the Colorado River and uplift) carved the canyon and exposed those layers.
- The Grand Canyon is in an area that was covered by water early in its geological history. — Marine and lake environments deposited large amounts of sediment that became the canyon’s sedimentary rocks.
Not correct:
- The Grand Canyon has an arid, desert-like climate. — Climate explains erosion rates and current weathering, not why the rocks are sedimentary.
- The majority of the Grand Canyon was formed from the heat and pressure along tectonic plate boundaries. — Heat and pressure produce metamorphic rocks; they do not account for the extensive sedimentary strata found in the canyon.
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