Rocks, soil profile, conservation Quiz - ICSE Class 7 Geography

Free practice quiz: Rocks, soil profile, conservation (ICSE Class 7 Geography). 43 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Frost wedging is a type of weathering that occurs when:

   1. Water expands as it freezes and widens cracks in rocks.
   2. Acidic rain dissolves rock minerals.
   3. Plant roots grow into rock fissures, exerting pressure.
   4. Carbon dioxide dissolves in rainwater to form carbonic acid.
   Show answer

   Answer: A. Water expands as it freezes and widens cracks in rocks.

   Frost wedging is a form of mechanical weathering where water seeps into cracks, freezes, expands, and widens the cracks, eventually breaking the rock. The other options describe chemical and biological weathering processes.

2. Which of the following rock types is most susceptible to chemical weathering by acid rain?

   1. Granite
   2. Basalt
   3. Limestone
   4. Sandstone
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   Answer: C. Limestone

   Limestone is primarily composed of calcium carbonate, which readily reacts with weak acids like carbonic acid (formed from carbon dioxide in rain) to dissolve, a process known as carbonation.

3. Planting trees and shrubs along the contour of hillsides is a conservation method known as:

   1. Terracing
   2. Windbreaks
   3. Contour plowing
   4. Reforestation
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   Answer: C. Contour plowing

   Contour plowing involves tilling and planting crops along the natural contour lines of the land to slow down water runoff and reduce erosion.

4. Soil that is formed from the weathering of the rock directly beneath it is called:

   1. Transported soil
   2. Residual soil
   3. Alluvial soil
   4. Glacial soil
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   Answer: B. Residual soil

   Residual soils are formed in place from the weathering of the bedrock on which they lie. Transported soils are moved from their original location by agents like water, wind, or ice.

5. The outermost layer of the Earth's crust, composed of unconsolidated material that supports plant life, is called:

   1. Bedrock
   2. Regolith
   3. Mantle
   4. Core
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   Answer: B. Regolith

   Regolith is the layer of loose, heterogeneous material covering solid rock. It includes weathered rock and soil, and it is the source material for soil formation.

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