“Rocks and Minerals” is Chapter 8 from Let’s Look Around and Learn EVS for students of Class 5 of JKBOSE. In the last post, you have read about Class 5 EVS Chapter 8 First Aid Notes. In this post, I am detailing to you Rocks and Minerals Class 5 EVS Question Answers. Let’s not waste much time and get started with the post:
Rocks and Minerals Class 5 EVS Question Answers
The chapter “Rocks and Minerals” provides basic knowledge about rocks, types of rocks, how rocks are made and their uses, what are minerals and how they are formed and what are the uses of minerals.
Rocks and Minerals Question Answers
Sedimentary Rocks Page 73
I. Fill in the blanks:
(a) Limestone is a _______ cock.
(b) Shale is formed of _______, _______ and _______
(c) Sandstones are commonly used as _______.
(a) Limestone is a biogenic cock.
(b) Shale is formed of compressed mud, silt and clay.
(c) Sandstones are commonly used as a building material.
Think and Answer Page 77-78.
I. Fill in the blanks.
Choose the right word/ words from the box:
sandstones, shelly, sedimentary, petroleum, marble, magma
- _______ rocks contain skeletons of sea animals.
- Vaseline is obtained from _______.
- _______ is used in making statues.
- The fiery hot substance inside the earth is called _______.
- Many buildings in Jaipur are built with _______.
- The _______ limestone is made up of broken seashells.
- Sedimentary rocks contain skeletons of sea animals.
- Vaseline is obtained from petroleum.
- Marble is used in making statues.
- The fiery hot substance inside the earth is called magma.
- Many buildings in Jaipur are built with sandstones.
- The shelly limestone is made up of broken seashells.
II. Name the following
- Two igneous rocks.
Ans. (1) Granite (ii) Basalt.
- Two sedimentary rocks.
Ans. (i) Sandstone (ii) Limestone.
- Two metamorphic rocks.
Ans. (1) Slate (ii) Marble
- Three useful minerals contained in granite.
Ans. (1) Quartz (ii) Plagioclase (iii) Olivine.
- Useful substances obtained from petroleum.
Ans. Useful substances obtained from petroleum are petrol, diesel, kerosene oil, paraffin wax, vaseline and wax.
- Metamorphic rocks which are formed from shale and limestone.
Ans. Slate is formed by the metamorphosis of shale.
Marble is formed from limestone when heat is applied on it.
- The hot, liquid rock found under the earth.
III. Classify the following rocks into igneous, sedimentary and metamorphic rocks:
slate marble shale sandstone limestone granite Basalt Gneiss rocksalt chalk
|Igneous Rocks||Sedimentary Rocks||Metamorphic Rocks|
IV. Answer the following questions
1. How are igneous rocks formed?
Ans. Igneous means fire-formed. There is a very hot molten substance inside the earth termed magma. Also, there is huge pressure inside the earth. At the places where the thickness of the earth’s mantle is less magma ruptures to the surface of the earth and comes out with great force forming a volcano. In a volcano, the magma pours out in a molten state. The molten magma cools and solidifies, forming a rock. Such rocks are called igneous rocks.
2. How are sedimentary rocks formed?
Ans. Igneous rocks are slowly broken down by wind, rain and water into tiny bits. These tiny broken bits of rocks are carried into the sea by the river. The rocky material along with seashells and skeletons of tiny sea animals settles in layers at the bottom of the sea. These are called sediments. With the passage of time, layers after layers settle over one another. The weight of the seawater and top layers squeezes the layers into solid rocks. Such rocks are called sedimentary rocks.
3. How are metamorphic rocks formed?
Ans. The intense heat and pressure inside the earth change the igneous and sedimentary rocks into metamorphic rocks. Metamorphosis means change.
4. What is an ore?
Ans. An ore is a mineral (useful metals) found in rock or mixed with loose rock materials.
5. How is coal formed?
Ans. Coal is a rock formed by the metamorphosis of the fossils (remains) of plants under the earth. Heat and pressure expel moisture, gases and other matter from these remains of plants, leaving behind carbon in different amounts, called coal.
6. How was petroleum formed?
Ans. Petroleum was produced millions of years ago by the bacterial decomposition of animals and plants which were buried underground to great depths in the earth’s crust.
7. State one use each of Quartz, granite and marble.
Ans. Use of Quartz.
1. It is a mineral used in making up igneous rocks.
2. It is also used in Jewellery and watch industry.
3. It also found its use in the glassmaking industry.
Use of Granite.
1. Granite is very hard in easily used in making buildings and statues
2. Polished granite is used for flooring.
3. Small pieces of granite are used to make the foundation for buildings and for paving roads.
Use of Marble.
Marble is an attractive building and sculpting material.
1. It is also used in making statues and buildings.
2. Calcium carbonate an important component of marble is used for Neutralizing Acids.
3. Calcium oxide (lime) formed after heating marble is used in soil treatment to reduce the acidity of the soil.
Rocks and Minerals Class 5 Summary Points
- A rock is a natural mass of mineral matter that makes up the earth’s crust.
- There are three main types of rocks, Igneous, Sedimentary and Metamorphic.
- The fiery hot substance inside the earth is called magma.
- Igneous rocks are formed by the cooling of lava on the surface of the
- Igneous rocks contain different minerals such as granite and basalt.
- Many temples in South India are made up of granite.
- Sedimentary rocks are formed by the deposition of sediments on the beds of seas and oceans.
- The intense heat and pressure inside the earth change the igneous and sedimentary rocks into metamorphic rocks.
- Sandstones, limestones, shale and rock salt are examples of sedimentary rocks. Sandstones are commonly used as building materials.
- Limestone is a biogenic rock which is made up of living material.
- Slate, marble, gneiss and coal are examples of metamorphic rocks.
- Many useful metals are found in rocks or mixed with loose rock materials. Such mixtures are called ores.
- Metals are extracted from ores.
- Coal is formed by the metamorphosis of the remains of trees and plants under the earth.
- Petroleum is a valuable mineral found in the rocks underground.
- Diamond is the hardest known naturally occurring substance.
That’s all we have about Rocks and Minerals Class 5 EVS Question Answers. Hope you get your answers. Do share your views about this post in comment section and share this post to others.