Class 5 Exam  >  Class 5 Notes  >  Science Class 5  >  The Earth

The Earth | Science Class 5 PDF Download

Introduction

According to scientists, the solar system was once a spinning cloud of hot gas and dust some 5,000,000,000 years ago. The Sun was formed at its center, where the majority of this cloud's material had gathered. The elements that made up the planets also came together in a number of other locations. One of them was the Earth. The Earth's crust, on which humans live, was gradually formed as the planet's surface cooled. On land, the crust is around 70 km thick, while the ocean floor is just about 5 km thick. 

The Earth has four layers. Let's discuss them in detail: 

The Earth | Science Class 5


Crust 

  • It is the outermost layer of the Earth made of rocks. 
  • Its thickness varies from 5 km under the ocean floor to 70 km under the continents. 
  • All continents and oceans lie on this layer. 

Mantle

  • It lies below the crust. It is about 2900 km thick. 
  • The upper part of the mantle consists of hard rocks and the lower part consists of hot molten rocks. 
  • When a volcano erupts, magma comes out from this layer. 
  • This layer contains iron, magnesium and aluminium. 

Question for The Earth
Try yourself:
What is the outermost layer of the Earth called?
View Solution

Core

  • It is the innermost layer of the Earth. 
  • It has two parts – outer core and inner core
  • The outer core is about 2300 km thick and inner core is about 1200 km thick. The outer core contains molten iron and nickel. The inner core is a solid ball made up of iron. 

The Earth | Science Class 5

The document The Earth | Science Class 5 is a part of the Class 5 Course Science Class 5.
All you need of Class 5 at this link: Class 5
44 videos|204 docs|45 tests

Up next

FAQs on The Earth - Science Class 5

1. What are the main layers of the Earth's atmosphere?
Ans. The main layers of the Earth's atmosphere are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
2. What is the composition of the Earth's atmosphere?
Ans. The Earth's atmosphere is primarily composed of nitrogen (about 78%), oxygen (about 21%), and small amounts of other gases such as argon, carbon dioxide, and water vapor.
3. How does the Earth's atmosphere protect life on Earth?
Ans. The Earth's atmosphere protects life on Earth by trapping heat from the sun, regulating temperatures, blocking harmful ultraviolet radiation, and providing oxygen for respiration.
4. What is the greenhouse effect and how does it impact the Earth's atmosphere?
Ans. The greenhouse effect is a natural process where greenhouse gases in the atmosphere trap heat from the sun, warming the Earth. However, human activities have increased the concentration of greenhouse gases, leading to global warming and climate change.
5. How does air pollution affect the Earth's atmosphere?
Ans. Air pollution can cause harm to the Earth's atmosphere by depleting the ozone layer, contributing to climate change, and impacting human health and ecosystems.
44 videos|204 docs|45 tests
Download as PDF

Up next

Explore Courses for Class 5 exam
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Related Searches

video lectures

,

Viva Questions

,

MCQs

,

The Earth | Science Class 5

,

The Earth | Science Class 5

,

pdf

,

Summary

,

Exam

,

study material

,

Sample Paper

,

Extra Questions

,

shortcuts and tricks

,

practice quizzes

,

Free

,

ppt

,

Important questions

,

Previous Year Questions with Solutions

,

Semester Notes

,

mock tests for examination

,

past year papers

,

The Earth | Science Class 5

,

Objective type Questions

;