Dc/Answer the following questions in one or two paragraphs.
HIN
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How are rocks different from minerals?
How are igneous rocks formed?
How do acidic igneous rocks differ from basic igneous rocks?
5. How are sedimentary rocks formed?
6. What are metamorphic rocks?
4.
7. Explain the structure of the earth's interior.
Answers
Question⇒ how are rocks different from minerals ?
Answer⇒ A mineral is a naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties. ... A rock is an aggregate of one or more minerals, or a body of undifferentiated mineral matter.
Question⇒ how are igneous rocks formed ?
Answer⇒Igneous rocks (from the Greek word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.
Question⇒ How do acidic igneous rocks differ from basic igneous rocks?
Answer⇒ 'Acidic' igneous rocks are rocks which are relatively high in silica and relatively low in iron and magnesium. 'Basic' igneous rocks are relatively low in silica and high in iron and magnesium. ... 'Acidic' igneous rocks are rocks which are relatively high in silica and relatively low in iron and magnesium.
Question⇒ How are sedimentary rocks formed ?
Answer⇒ Clastic sedimentary rocks are made up of pieces (clasts) of pre-existing rocks. Pieces of rock are loosened by weathering, then transported to some basin or depression where sediment is trapped. If the sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock.
Question⇒ . What are metamorphic rocks?
Answer⇒ Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.
Question⇒ Explain the structure of the earth's interior.
Answer⇒ The internal structure of Earth is layered in spherical shells: an outer silicate solid crust, a highly viscous asthenosphere and mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core.
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Q. How are rocks different from minerals?
A). A rock has single or a combination of several minerals in addition to mass of the material. These minerals are present in small or large amount at any given site of the earth. Most common minerals occurring inside the earth are iron, silver, gold, mica, bauxite and lead.
Q. How are igneous rock formed?
A.) The word 'igneous ' means "coming out of fire".Thus, the igneous rocks are formed due to intensive heat and pressure where molten material called magma comes out and solidifies over the surface as lava. The cooling and solidification of magma can take place inside the earth's forming Intrusive Igneous rocks, for example, Granite. If it cools over the earth's surface, it forms Extrusive Igneous rocks, for example, Basalt.
Q. How does acidic igneous rocks differ from basic igneous rocks?
A.) Acidic igneous rocks are comparatively rich in silica in comparison with iron and magnesium.
But, basic igneous rocks are relatively rich in iron and magnesium as compared to silica.
Q. How are sedimentary rocks formed?
A.) The igneous rocks are subjected to weathering and denudation over the years by the agents of gradation. The continuous action of these agents on rocks breaks them into small rock pieces that are carried by rivers. They are then deposited on the river beds or sea beds. These deposit are called sediments which form layers one above the other. Due to the pressure of the above layer and the presence of cementing particles, they. Are hardened to form sedimentary rocks.
Q. What are metamorphic rocks?
A.) Rocks which originally are igneous or sedimentary in nature, get changed in character and appearance due to the heat and pressure and are called Metamorphic rocks. For example, granite is igneous but changes into metamorphic as gneiss.
Q. Explain the structure of the earth interior.
A.) The interior is made up of three layers -Crust, the Mantle and the Core.
The Crust -The thin solid layer covering the outside of the earth is called the Crust.
The Mantle-Mantle is a very thick layer lying beneath the crust. The mantle extends up to 2900km in depth..
The core-The innermost part of the earth is known as Core. The care has a thickness of 3470km.
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