2. Answer the following questions in one sentence : (1) Which minerals are mainly composed in SiAl layer (2) Name the three main types of rocks. (3) What are the intrusive igneous rocks? (4) What is Endogenic force ? (5) What is waterfall ? . Write a short note on:
Answers
1 : The main mineral constituents of the continental mass are silica and alumina
2:igneous, sedimentary, and metamorphic.
3:Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. ... Endogenic forces are the pressure within the earth
4:Endogenic forces are the pressure within the earth, also known as internal forces. Such internal forces contribute to vertical and horizontal motions and lead to subsidence, land upliftment, volcanism, faulting, folding, earthquakes, etc.
5: A waterfall is a point in a river or stream where water flows over a vertical drop or a series of steep drops. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf
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Answer:
Ans 1) The main mineral constituents of the continental mass are silica and alumina. It is thus called sial (si-silica and al-alumina).
Ans 2) There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies.
Ans 3) Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form. Examples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. ... Dacite is a fine-grained, extrusive igneous rock that is usually light in color.
Ans 4) Endogenic forces are the pressure within the earth, also known as internal forces. Such internal forces contribute to vertical and horizontal motions and lead to subsidence, land upliftment, volcanism, faulting, folding, earthquakes, etc.
Ans 5) A waterfall is a place where water flows over a vertical drop or a series of steep drops in the course of a stream or river. Waterfalls also occur where melt water drops over the edge of a tabular iceberg or ice shelf. Often, waterfalls form as streams flow from soft rock to hard rock.
Explanation:
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