Question

state the characteristics of sedimentary rocks

Answer 1

Explanation:

Sedimentary rocks are largely found on the Earth's surface. They cover 75% area of the Earth. These rocks are generally not crystalline in nature. They are soft and have many layers as they are formed due to the deposition of sediments.

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Answer 2

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State the characteristics of sedimentary rocks.

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Following are the five main characteristics of sedimentary rocks —

(1) Sedimentary rocks are formed of sediments derived from the older rocks, plant and animal remains and thus these rocks contain fossils of plants and animals. The age of the formation of a given sedimen­tary rock may be determined on the basis of the analysis of the fossils to be found in that rock.

(2) The deposition of sediments of various types and sizes to form sedimentary rocks takes place in certain sequence and system. The size of sediments decreases from the littoral margins to the centre of the water bodies or sedimentation basins. Different sediments are consolidated and compacted by differ­ent types of cementing elements e.g., silica, iron com­pounds, calcite, clay etc.

(3) Sedimentary rocks contain several layers or strata but these are seldom crystalline rocks.

(4) Like igneous rocks sedimentary rocks are not found in massive forms such as batholiths, laccoliths, dykes etc.

(5) Layers of sedimentary rocks are seldom found in original and horizontal manner. Sedimentary layers are generally deformed due to lateral compressive and tensile forces. The beds are folded and found in anticlinal and synclinal forms. Tensile and compressive forces also create faults due to dislocation of beds.

Explanation:

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