Consider the following statements made about sedimentary rocks:
1. Sedimentary rocks are formed at earth’s surface by the hydrological system
2. Formation off sedimentary rocks involves the weathering of pre - existing rocks
3. Sedimentary rocks contains fossils
4 Sedimentary rocks typically occurs in layers
Which of this statement are correct?
Consider the following statements made about sedimentary rocks:
1. Sedimentary rocks are formed at earth’s surface by the hydrological system
2. Formation off sedimentary rocks involves the weathering of pre - existing rocks
3. Sedimentary rocks contains fossils
4 Sedimentary rocks typically occurs in layers
Which of this statement are correct?
The correct option is D 1,2,3,4.
All the statements are true about sedimentary rocks.
The term ‘sedimentary’ is derived from the Latin word sedimentum, which means settling. Rocks (igneous, sedimentary and metamorphic) of the earth’s surface are exposed to denudational agents, and are broken up into various sizes of fragments. Such fragments are transported by different exogenous agencies and deposited. These deposits through compaction turn into rocks. This process is called lithification. In many sedimentary rocks, the layers of deposits retain their characteristics even after lithification. Hence, we see a number of layers of varying thickness in sedimentary rocks like sandstone, shale etc.
Depending upon the mode of formation, sedimentary rocks are classified into three major groups:
1. mechanically formed — sandstone, conglomerate, limestone, shale, loess etc. are examples;
2. organically formed— geyserite, chalk, limestone, coal etc. are some examples;
3. Chemically formed — chert, limestone, halite, potash etc.
Sedimentary rocks themselves can turn into fragments and the fragments can be a source for formation of sedimentary rocks. The crustal rocks (igneous, metamorphic and sedimentary) once formed may be carried
down into the mantle (interior of the earth) through subduction process (parts or whole of crustal plates going down under another plate in zones of plate convergence) and the same melt down due to increase in temperature in the interior and turn into molten magma, the original source for igneous rocks.
1,2,3,4.
All the statements are true about sedimentary rocks.
The term ‘sedimentary’ is derived from the Latin word sedimentum, which means settling. Rocks (igneous, sedimentary and metamorphic) of the earth’s surface are exposed to denudational agents, and are broken up into various sizes of fragments. Such fragments are transported by different exogenous agencies and deposited. These deposits through compaction turn into rocks. This process is called lithification. In many sedimentary rocks, the layers of deposits retain their characteristics even after lithification. Hence, we see a number of layers of varying thickness in sedimentary rocks like sandstone, shale etc.
Depending upon the mode of formation, sedimentary rocks are classified into three major groups:
1. mechanically formed — sandstone, conglomerate, limestone, shale, loess etc. are examples;
2. organically formed— geyserite, chalk, limestone, coal etc. are some examples;
3. Chemically formed — chert, limestone, halite, potash etc.
Sedimentary rocks themselves can turn into fragments and the fragments can be a source for formation of sedimentary rocks. The crustal rocks (igneous, metamorphic and sedimentary) once formed may be carried
down into the mantle (interior of the earth) through subduction process (parts or whole of crustal plates going down under another plate in zones of plate convergence) and the same melt down due to increase in temperature in the interior and turn into molten magma, the original source for igneous rocks.
