Why are sedimentary rocks called secondary rocks?

Answer 1

There are three types of rocks--igneous, metamorphic, and sedimentary.

Igneous rocks form from cooled magma(melted rock underneath Earth's surface). An igneous rock is intrusive if it formed underneath Earth's surface; they usually have large mineral grains, or crystals. An igneous rock is extrusive if it formed near Earth's surface; the lava(what magma's called when it's reached the surface) cooled so quickly that there was no time for mineral grains to grow. They have fine grained texture.

Metamorphic rocks are formed underground by heat and pressure. A metamorphic rock is foliated if it has bands(layers). It is nonfoliated if it has no bands. Metamorphic rocks can be formed from any other type of rock.

Sedimentary rocks are formed from sediments, which is why they're called sedimentary rocks. Sediments are loose materials like pieces of rock, mineral grains, and dead plants and animals. These sediments have been compressed and cemented to form a rock. Sedimentary rocks can also form when minerals are dissolved in liquid and when the liquid evaporates, rocks are left behind.

Rock Cycle: Igneous, metamorphic, and sedimentary rocks can be changed from one type of rock to another through a process called the rock cycle. The sediments in sedimentary rocks can actually be broken parts of other rocks, like igneous and metamorphic. All the rocks are connected.

Answer 2

They are called secondary rocks because they were formed from sediments and/or minerals which were part of pre-exisiting rocks. Erosion occurs through mechanical or chemical means, and either wind or water transports these particles, or chemicals to another location where they will form new rocks. Since the properties of the orignal rock are not changed sedimentary rocks are 'secondary' rocks. They form from either igneous/volcanic or metamorphic or other sedimentary rocks.

Answer 3

Because they derive, (originate from), other rocks. Due to erosion igneous, sedimentary and metamorphic rocks will be washed down to lower areas where they will form sediments, later compacting into sedimentary rock.

Answer 4

It is because the majority of sedimentary rocks are composed of particles or sediments from other rocks.

Answer 5

Because they are derived by the denudation of other pre existing or parent rocks

Answer 6

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