Maharashtra Board Class 6 Geography Solution Chapter 7 – Rocks and Rock Types
Balbharati Maharashtra Board Class 6 Geography Solution Chapter 7: Rocks and Rock Types. Marathi or English Medium Students of Class 6 get here Rocks and Rock Types full Exercise Solution.
Std |
Maharashtra Class 6 |
Subject |
Geography Solution |
Chapter |
Rocks and Rock Types |
B) Which of the following monuments are built in igneous rock?
(1) The Taj Mahal (2) Fort Raigad (3) The Red Fort (4) Ellora Sculpture
A:- 4 and 2
(C) Find the differences between_
(1) Igneous and sedimentary rocks
Igneous rock |
sedimentary rock |
Igneous rock are usually formed by the cooling and solidification of lava and magma. |
Sedimentary rocks are usually formed by solidification of eroded by air water. |
It is usually heavier in weight |
It is usually light In weight |
EX – Granite basalt |
Ex – sandstone lime stone |
(2) Sedimentary and metamorphic rocks
Sedimentary rock |
Metamorphic rock |
Sedimentary rocks are usually formed by solidification of eroded by air water. |
Volcanic activity and other earth movement have been happening on earth all the time. So when these events occur the volcanic and sedimentary rocks in the region are transformed by intense heat and pressure and the resulting rock is called metamorphic rocks. |
Ex – sand stone |
Ex – marble slate |
(3) Igneous and metamorphic rocks
Igneous rock |
Metamorphic rock |
Igneous rock are usually formed by the cooling and solidification of lava and magma. |
Volcanic activity and other earth movement have been happening on earth all the time. So when these events occur the volcanic and sedimentary rocks in the region are transformed by intense heat and pressure and the resulting rock is called metamorphic rocks. |
Ex – basalt granite |
Ex- diamond marble |
(D) Which types of rocks are predominantly found at the following locations?
(1) Central Maharashtra – Basalt.
(2) South Konkan – Laterite.
(3) Vidarbha – Sedimentary.
More Extra Questions from this Chapter:
1.) What is rock ?
A:- A solid compound made up of a combination of minerals up of a combination of minerals that make up the crust is commonly called rock.
2.) How many types of rocks are found in the world ?
A:- There are three types of rocks in the world. E.g. Igneous Rocks / Primary Rocks, Sedimentary Rocks, Metamorphic Rocks.
3.) What is magma ?
A:- The rock beneath the interior of the earth melts under intense heat an pressure called magma.
4.) What is lava ?
A:- When magma came out of the surface it was called lava.
5.) What is Igneous Rocks ?
A:- Magma comes out of the surface and forms lava. The rock that cools the lava is called igneous rock.
6.) Igneous rocks also known as ___________ .
A:- Primary rocks
7.) Which of these regions of india is composed of igneous rock ?
A:- The plateau of Maharashtra in india and the Sahyadris are formed of igneous rocks.
8.) An example of a volcanic rock is – Limestone / Slate / Basalt .
A:- Basalt
9.) Which volcanic rock floats in the water ?
A:- Pumice rock floats in the water.
10.) Write a short note about the FOSSILS.
A:- Fossils are the remains of ancient plants and animals that create an impression on the rock as a result of extreme heat and pressure.
11.) ____________ was used for the construction of the
Red Fort at Delhi.
A:- sedimentary rock
12.) How metamorphic rock formed ?
A:- Volcanic activity and other earth movement have been happening on earth all the time. So when these events occur the volcanic and sedimentary rocks in the region are transformed by intense heat and pressure and the resulting rock is called metamorphic rocks.
13.) The Taj Mahal at Agra is built in ________________ .
A:- Marble
14.) The marble used to build the Taj Mahaal was brought from __________ .
A:- Makrana in Rajasthan
15.) Where is the laterite rock found in Maharashtra ?
A:- In the coastal region of Konkan in Maharashtra find laterite rock.
It is found specially in Ratnagiri and Sindhudurg districts.
16.) Match the following
Original rock | Metamorphic rocks |
Shale | Marble |
Basalt | Diamond |
Sandstone | Quartzite |
Coal | Gneiss |
Limestone | Slate |
Granite | Amphibolite |
More Extra Questions
Multiple choice questions: (marks:1)
1.) A major example of igneous rock is:
a) Basalt
b) Limestone
c) Corals
Ans: Basalt.
2.) Limestone is an example of:
A.) Igneous rock
B.) Sedimentary rock
C.) Metamorphic rock
Ans: sedimentary rock.
3.) An example of metamorphic rock is:
A.) Slate
B.) Corals
C.) Diamond
Ans: Diamond.
Answer the following questions: (marks:1)
1.) What do you mean by rocks?
Ans: Rocks are a mixture of different minerals formed by natural processes in the lithosphere.
2.) What are the major rock forming minerals?
Ans: Silica, Aluminium, Magnesium and iron are the major rock forming minerals.
3.) What is pumice stone?
Ans: Pumice is an example of igneous rock. This is formed out of volcanic froth. It is a porous rock. As its density is quite low, it can float on water.
4.) What are the examples of igneous rock?
Ans: Basalt, Granite,pumice stone etc. Are examples of igneous rock.
5.) What are the examples of sedimentary rock?
Ans: coal, sandstone,shale,corals, limestone etc. Are examples of sedimentary rock.
6.) Write down the examples of metamorphic rock?
Ans: Marbles, diamond, quartzite,slate etc. Are examples of metamorphic rocks.
Answer the following questions: (marks:2)
1.) What are the different types of rock?
Ans: According to the formation process there are three different types of rock present:
A.) Igneous rocks or primary rocks
B.) Sedimentary rocks
C.) Metamorphic rocks.
2.) Taj Mahal is built by which type of rock?
Ans: The Taj Mahal at Agra is built by Marbles. Marble is a metamorphic rock. This rock was brought from mines in Makrana in Rajasthan.
3.) What are fossils?
Ans: The buried remains of dead animals or plants become subject to heavy pressure. As a result their impressions get marked in the rocks. At times the buried animals or plants get petrified; these are called fossils. The study of fossils provides information about life in that period.
4.) What is a volcano?
Ans: The interior of the earth has very high temperature. As a result, the material in this part is in the molten state. Sometimes this material gets released through the fissures in the crust. This is called a volcano. Lava, gases, dust, ashes, etc. are thrown out during volcanic eruptions.
5.) Why are igneous rocks called primary rocks?
Ans: igneous rocks are formed out of the materials from the interior of the Earth. So, these rocks are known as primary rocks.
Write down the difference between igneous rock, sedimentary rock and metamorphic rock?
Ans: subject: A. Definition
- Type
- Presence of fossils
- Examples
Igneous rocks:
- When the molten material, known as magma within the crust and lava on the surface, cools down, it solidifies giving rise to rocks. These are known as igneous rocks.
- Igneous rocks are hard, homogenous and heavy as well.
- Fossils are not present.
- Basalt, Granite etc.
Sedimentary rocks:
- Due to continuous variations in the temperature, rocks develop cracks. And the water filtrate through rocks dissolves the soluble minerals. This leads to the weathering of rocks. They get disintegrated or decomposed. Then, they get reduced to pieces. These rock particles get transported by rivers, glaciers, wind, etc. towards low lying areas and are deposited there. One after the other, layers of sediments get deposited
in this way. The upper layers exert heavy pressure on the lower layers. This leads to compaction of material and development of sedimentary rocks.
- Sedimentary rocks are fragile and lightweight.
- Fossils are present.
- Limestone, sandstone,corals etc.
Metamorphic rocks:
- Due to the Volcanic activity and other movements the igneous or sedimentary rocks that present in that region are gone through tremendous pressure and heat. This leads to changes in the nature as well as the chemical composition of the original rocks. The crystals in the original rocks get re-crystallized. This means the rocks get metamorphosed. The rocks formed through such a process are called metamorphic rocks.
- Metamorphic rocks are heavy and hard.
- Fossils are not present.
- Marble, diamond, slate, quartzite etc.
Answer the following questions: (marks:5)
1.) Explain about the different types of rocks?
Ans: According to the formation process there are three different types of rock present:
A.) Igneous rocks or primary rocks
B.)Sedimentary rocks
C.) Metamorphic rocks.
- Igneous rocks or primary rocks:
When the molten material, known as magma within the crust and lava on the surface, cools down, it solidifies giving rise to rocks. These are known as igneous rocks. As these rocks are formed out of the material from the interior of the earth, these are also referred to as primary rocks. Mostly these rocks appear hard and homogeneous. These are heavy as well. Basalt is a major example of igneous rock.
- Sedimentary rocks:
Due to continuous variations in the temperature, rocks develop cracks. Similarly, the water filtrate through rocks dissolves the soluble minerals. This leads to the weathering of rocks. They get disintegrated or decomposed. Then, they get reduced to pieces. These rock particles get transported by rivers, glaciers, wind, etc. towards low lying areas and are deposited there. One after the other, layers of sediments get deposited in this way. The upper layers exert heavy pressure on the lower layers. This leads to compaction of material and development of sedimentary rocks.
One can easily see layers in the sedimentary rocks. While layers are getting deposited the remains of dead animals or plants get buried in these layers at
times. Therefore, one may find fossils in sedimentary rocks. Sedimentary rocks are generally fragile or breakable and lightweight. Most of them are porous. Sandstone, limestone, shale, corals, etc. are sedimentary rocks.
- Metamorphic rocks:
Volcanic activity and other earth movements constantly take place on the earth. While these are occurring, the igneous or sedimentary rocks in that region are gone through tremendous pressure and heat. This leads to changes in the nature as well as the chemical composition of the original rocks. The crystals in the original rocks get re-crystallized. This means the rocks get metamorphosed. The rocks formed through such a process are called metamorphic rocks. These rocks do not contain fossils. These rocks are heavy and hard. Marbles, diamonds ,slate, quartzite etc. Are the examples of metamorphic rocks.
Thank you!