Help please 1. Igneous rock forms by a. melting of previously existing rock mate

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Help please

1. Igneous rock forms by a. melting of previously existing rock material at the surface of the Earth. b. solidification of magma in the atmosphere. c. solidification of magma deep within the Earth. d. solidification of magma at the surface orwithin the Earth. 2. The formation of a sedimentary rock may involve a precipitation of minerals when water evaporates. b. consolidation of many shells C. transportation of fragments of rock weathered from previously existing rocks d. All of the above. 3. The formation of a metamorphic rock differs from that of a sedimentary or igneous rock in thar a. it does not form from a previously existing rock b. both melung and weathering are needed to form a meramorphic rock C changes from the previously existing rock from which it forms all take place in the solid state d. All of the above 1. Which of the tollowing is a possible onigin of ameta morphic rock a Igneous rocks are weathered, eroded, and depos ited in a lake b. An igneous rock in Farth's mantle melts and cools in the crust. c. A sedimentary rockis burned deeply beneatlh other sedimentary rocks d. A volkano crupts and large amiounis et hot ash lall in the occan I he rexiure of a rock is comrolled by a. the process by wluch n toms b, the minerals it contains d. the pressure when iniS

Explanation / Answer

Q.1) Igneous rock forms by

Ans. d. solidification of magma at the surface or within the Earth.

Igeous rocks formd by the solidification of magma at the Earths interior (intrusive igneous rock) or eruption at the Earths surface (extrusive igneous rock).

Q.2) The formation of a sedimentary rock may involve

Ans. d. all of the above.

All the above process are responsible for the formation of saedimentary rock.

Q.3) The formation of a metamorphic rock differs from that of a sedimentary or igneous rock in that

Ans. c. changes from the previously existing rock from which it forms all takes place in the solid state.

Q.4) Which of the following is a possible origin of a metamorpic rock ?

Ans. c. A sedimentary rock is buried deeply beneath other sedimentary rocks.

Q.5) The texture of a rock is controlled by

Ans. a. The process by which it forms.

Texture of a rock is defied by the size, shape and arrangement of the grains or crystals. And these all things are controlled by the process by which it forms.

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