Q. 1 Answer the following questions in short:
(1) Which Planet is known as homeland planet?
(2) Which is the special feature of "crust" layer?
(3) What is the earth crust is made up of?
(4) Which mineral Constituents the oceanic crust?
(5) Which type of rock is known as primary rock?
(6) What do you mean by fossils?
(7) Define the term "Igneous rock".
(8) What do you mean by rock cycle?
Answers
Answer:
(1) earth
(2) In geology, a crust is the outermost layer of a planet. The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks.
(3) The crust is made of solid rocks and minerals. Beneath the crust is the mantle, which is also mostly solid rocks and minerals, but punctuated by malleable areas of semi-solid magma. At the center of the Earth is a hot, dense metal core.
(4) Olivine, an iron-magnesium silicate, is a common mineral in the lower gabbro layer.
(5) igneous and magmatic
(6) Fossil, remnant, impression, or trace of an animal or plant of a past geologic age that has been preserved in Earth's crust.
(7) 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.
(8) The rock cycle is a concept used to explain how the three basic rock types are related and how Earth processes, over geologic time, change a rock from one type into another. Plate tectonic activity, along with weathering and erosional processes, are responsible for the continued recycling of rocks.
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