Question

Sedimentary rocks account for about what percentage of the Earth's outermost 10 kilometers of rock (first percentage). Also, what percentage of the Earth's continental area is covered by sedimentary rocks (second percentage)?
a. 65%; 10%
b. 3.5%; 100%
c. 5%; 75%
d. 85%; 100%

Answer 1

Sedimentary rocks cover "5%" of the "Earth’s outermost 10 Km" of "rock" while "75%" of "Earth’s continental area" is covered.

Option: C

Explanation:

These rocks covered 5% of the Earth's outermost 10 kilometers of rock (first %) while 75% of the Earth's continental area is covered (second %). These were originated from metamorphic rocks, pre-existing igneous and sedimentary rocks. Some common sedimentary rock types are Sandstone, shale, Limestone, Conglomerate, Chemical and Organic sedimentary rocks. These rocks are resulted from lithification of sediments, precipitate out from solution and consolidation of the remains of plants and animals and its example is Coal.