1.(a)  What are the four major domains of the earth?


Explanation:


 The lithosphere, atmosphere, hydrosphere, and ecosystem are the Earth's four primary spheres. The troposphere, stratosphere, mesosphere, thermosphere, and exosphere are the four additional levels that are separated from the atmosphere based on makeup, temperature, and other characteristics.

2.(b)  Name the major continents of the earth.

Explanation:


 The planet has seven main regions. These are what they are:


Asia

Europe

Africa

The Americas

Latin America

Australia

Antarctica


3.(c)  Name the two continents that lie entirely in the Southern Hemisphere.

Explanation:


Australia and Antarctica are the only two countries that are entirely located in the Southern hemisphere. Here are some intriguing details about Australia: a. Due to its location so far south, Australia's landmass is sometimes referred to as the Land Down Under.

4.(d)  Name the different layers of the atmosphere.

Explanation:


 Each stratum in the Earth's atmosphere has unique characteristics. These levels, which rise from the surface of the earth, are known as the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Over time, the exosphere progressively disappears into outer space

5.(e)  Why is the earth called the ‘blue planet’?

Explanation:


 Due to the abundance of water on earth, it is known as the "blue planet." In reality, water makes up more than 70% of the planet. The phrase "the blue planet" was thus created in response to this. In fact, the ocean holds an astounding 97 percent of the water that is prevalent in this area

6.(f)  Why is the Northern Hemisphere called the Land Hemisphere?

Explanation:


 Because it has a greater proportion of territory than the Southern Hemisphere, the Northern Hemisphere is also known as the "Land Hemisphere" of the planet. The
majority of the territory on Earth is located in the Northern Hemisphere, or above the 0° equator, as can be seen on the globe map.

7.(g)  Why is the Biosphere important for living organisms?

Explanation:


 The biosphere is the region where earth, water, and air meet. Only in this region does life survive due to its perfect climate. The Biosphere is crucial for living things
because of this. The term "biosphere" describes the region of the planet and its atmosphere where living things can sustain existence.

  1. 8Tick the correct answers.

(a) The mountain range that separates Europe from Asia is

(i) The Andes (ii) the Himalayas (iii) the Urals

Explanation:


The correct option is (iii) the Urals.

Reason Europe and Asia are divided by the Ural mountain ranges. They have a length of 2500 metres and travel through Western Russia in a north-south path. One of the world's earliest mountain groups is this one. Five mountain groups make up the Ural Mountains.

9.(b) The continent of North America is linked to South America by

(i) An Isthmus (ii) a Strait (iii) a Canal

Explanation:


 The correct option is (i) an Isthmus 

Reason - The third-largest landmass in the globe is North America. The Isthmus of Panama, a remarkably small piece of territory, connects it to South America.

10.(c) The major constituent of the atmosphere by per cent is

(i) Nitrogen (ii) Oxygen (iii) Carbon dioxide

Explanation:


The correct option is (i) Nitrogen.

Reason - By proportion, nitrogen—the most prevalent element in the Earth's atmosphere—is a significant component. It accounts for 78% of the total weight and 79.1% of the volume of the molecules in the Earth's atmosphere. With a 20% composition, oxygen ranks as the second most prevalent element.

11.(d) The domain of the earth consisting of solid rocks is

(i) The Atmosphere (ii) the Hydrosphere (iii) the Lithosphere

Explanation:


 The correct option is (iii) the Lithosphere.

Reason - The lithosphere of earth is composed of crust and solid rocks. The domain of the earth consisting of solid rocks is the lithosphere. This is the correct answer to this question. Option d: None of these cannot be the correct answer because the domain of the earth consisting of solid rocks is the lithosphere.

12.(e) Which is the largest continent?

(i) Africa (ii) Asia (iii) Australia

Explanation:


The correct option is (ii) Asia.

Reason - Asia is the world's biggest continent in terms of both area and people. More than 44 million square kilometres make up its surface. It also has two thirds of the world's inhabitants.

  1. 13.Fill in the Blanks

(a)The deepest point on the earth is _____________ in the Pacific Ocean.

(b) The _____________ Ocean is named after a country.

(c) The _____________ is a narrow contact zone of land, water and air that

Supports life.

(d) The continents of Europe and Asia together are known as _____________.

(e) The highest mountain peak on the earth is ________

Explanation:


(
a)  The deepest point on the earth is Mariana Trench in the Pacific Ocean.

The Mariana Trench is about 1,580 miles (2,550 kilometres) long and situated to the east of the Mariana Islands, which lend the trench its name. (Opens in new tab). According to the National Oceanic and Atmospheric Administration (opens in new tab), the Mariana Trench's deepest location is a basin known as the Challenger Deep, which is situated at the southern extremity of the trench. (NOAA).

(b) The Indian Ocean is named after a country.

The only waterway bearing the moniker of India is the Indian waterway. The water is almost triangular in form. It is encircled by Asia to the north, Africa to the west, and Australia, the tiniest continent, to the east.

(c) The Biosphere is a narrow contact zone of land, water and air that supports life.

Rivers have been useful channels for moving products and people over great distances.  Even today, many nations rely heavily on inland water transport because it is less expensive, more dependable, and environmentally friendly than shipping products by road or train. This is particularly true for large and heavy freight.

(d) The continents of Europe and Asia together are known as Eurasia.

Eurasia is a geological and geopolitical word that refers to a singular, huge territory made up of the countries of Europe and Asia as well as the societal body that lies within that area, the boundaries of which are still up for dispute. The phrase is a combination of Europe and Asia.

(e) The highest mountain peak on the earth is Mount Everest.

A summit in the Himalayan mountain region is known as Mount Everest. It is situated halfway between Nepal and Tibet, a Chinese independent territory. It is regarded as the highest peak on Earth at 8,849 metres (29,032 feet). The peak was given the name George Everest in the eighteenth century in honour of an earlier Surveyor General of India. Chomolungma is a Tibetan moniker that translates to "Mother Goddess of the World." Sagarmatha is a name with many connotations in Nepali.