QCM : Landscape Formation and Erosion — 10 questions

Explication

Hydrochloric acid reacts with carbonate minerals such as limestone, producing bubbles (carbon dioxide gas). This reaction confirms the presence of carbonate minerals in the rock.

Explication

The distinct stripes on canyon walls that show varying sedimentary layers are a visual result of deposition over time, making this the correct answer. The other options do not represent sedimentary layering.

Explication

In the cake analogy, the 'knife' represents the Colorado River, which cuts through the sedimentary layers, carving the canyon and exposing the different strata.

Explication

Hydrochloric acid reacts with carbonate minerals such as limestone, producing bubbles of carbon dioxide, which is useful for testing carbonate rocks. The other acids do not produce this reaction with limestone.

Explication

The stripes on canyon walls are indicative of different sedimentary rock layers, each representing a distinct period of deposition and geological history. These layers help geologists understand the sequence of events that formed the canyon.

Explication

Limestone is a sedimentary rock formed from the accumulation of calcium carbonate sediments, unlike granite and basalt, which are igneous, and gneiss, which is metamorphic.

Explication

The Colorado River is the main erosive force responsible for carving the Grand Canyon, exposing stratification in the rock layers.

Explication

Mechanical weathering involves physical processes like freeze-thaw and abrasion that break rocks apart without altering their minerals.

Explication

Graded bedding forms in still water, with larger, coarser sediments settling at the bottom and finer sediments at the top due to the decrease in energy over time.

Explication

Hydrochloric acid is used to test for carbonate minerals because it reacts with them and produces bubbles, indicating their presence.