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37 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
What is meant by rock cycle?
Answer
One type of rock changes to another type under certain conditions in s cycle manner. This process of transformation of the rock from one another is known as the rock cycle.
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Question 21 Mark
What is the Greek word for metamorphic?
Answer
Greek word for metamorphic is metamorphose meaning change of form.
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Question 61 Mark
What are the main constituents of the continental mass?
Answer
The main mineral constituents of the continental mass are silica and alumina. It is thus called sial (si-silica and al-alumina).
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Question 81 Mark
What are sediments?
Answer
Rocks roll down, crack and hit each other and are broken into small fragments. These smaller particles are called sediments.
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Question 101 Mark
What happens to igneous and sedimentary rocks when they are subjected to great heat and pressure?
Answer
Igneous and sedimentary rocks change into metamorphic rocks under great heat and pressure.
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Question 111 Mark
How are metamorphic rock formed?
Answer
Igneous and sedimentary rocks can change into metamorphic rocks under great heat and pressure. For example, clay changes into slate and limestone into marble.
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Question 141 Mark
What is the Latin word for sedimentary?
Answer
Latin word for sedimentary is sedimentum which means settle down.
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Question 151 Mark
Why we cannot go to the centre of the earth?
Answer
To reach to the centre of the earth we will have to dig a hole 6000km deep on the ocean floor. This is not possible, so we cannot go to the centre of the earth.
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Question 191 Mark
What are the main mineral constituents of the continental mass?
Answer
The main mineral constituents of the continental mass are silica and alumina.
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Question 201 Mark
What happens when igneous and sedimentary rocks go under great heat and pressure?
Answer
They change into metamorphic rocks.
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Question 211 Mark
Write about the deepest mine in the world.
Answer
The deepest mine in the world, is in South Africa. It is about 4km deep. In search for oil engineers have dug a hole about 6km deep.
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Question 221 Mark
How much of the earth is crust, mantle and core?
Answer
The crust forms only 1 percent of the volume of the earth, 84 percent consists of the mantle and 15 percent makes the core.
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Question 231 Mark
Limestone is changed into marble. Give reason?
Answer
Marble is a metamorphic rock that forms when limestone is subjected to great heat and pressure.
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Question 281 Mark
What are the three types of rocks on Earth?
Answer
The three main types are, igneous, sedimentary, and metamorphic.
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Question 291 Mark
How are igneous rocks formed?
Answer
Igneous rocks are formed from the cooling and solidification of magma at high temperatures. The magma comes from deep within our Earth.
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Question 311 Mark
What makes up the crust of the earth?
Answer
The earth’s crust is made up of various types of rocks such as igneous, metamorphic, and sedimentary rocks.
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Question 341 Mark
What are the main constituents of the oceanic crust?
Answer
The oceanic crust mainly consists of silica and magnesium. It is therefore called sima (si–silica and ma–magnesium).
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Question 351 Mark
What is a rock?
Answer
Any natural mass of mineral matter that makes up the earth’s crust is called a rock.
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Question 361 Mark
What are metamorphic rocks?
Answer
When the igneous and sedimentary rocks are subjected to heat and pressure they change into metamorphic rocks.
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Question 371 Mark
Define rock cycle?
Answer
The process of transformation of the rock from one to another is known as rock cycle.
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Question(1 Marks) - Social Science STD 7 Questions - Vidyadip