High School

1. How can you tell where limestone crops out at Earth's surface in this orthoimage area? Check all that apply.

A. The areas underlain by limestone have a mottled appearance with lots of small circular depressions, like the dimples on the surface of a golf ball.

B. The areas underlain by limestone generally are of low elevation and the hills lack steep slopes because the bedrock is weakened or dissolved by chemical weathering.

C. There are sinkholes, small lakes, solution valleys, and disappearing streams on the portions of the map where limestone bedrock occurs at/near the surface.

D. Trees do not grow on limestone.

E. Roads are situated exclusively on the limestone bedrock.

Answer :

Based on the provided options, the following choices apply to identifying where limestone crops out at the Earth's surface in the given orthoimage area.

a. The areas underlain by limestone have a mottled appearance with lots of small circular depressions, like the dimples on the surface of a golf ball. Limestone is susceptible to chemical weathering, resulting in the formation of sinkholes and dolines, which appear as circular depressions.

b. The areas underlain by limestone generally are of low elevation, and the hills lack steep slopes because the bedrock is weakened or dissolved by chemical weathering. Limestone is prone to erosion by water, resulting in a more subdued topography with gentle slopes.

c. There are sinkholes, small lakes, solution valleys, and disappearing streams on the portions of the map where limestone bedrock occurs at/near the surface. These landforms are characteristic of karst topography, which forms in regions with soluble limestone bedrock.

It is important to note that options d and e, namely "trees do not grow on limestone" and "roads are situated exclusively on the limestone bedrock," are not accurate statements and do not apply to identifying the presence of limestone.

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