Origin and Evolution of the Earth class 11 Geo 1

Chapter 1: Origin and Evolution of the Earth

 1. Introduction

- This chapter discusses the theories and processes that explain the origin of the universe, the solar system, and the Earth.

- It includes a study of the early conditions on Earth and how they led to the formation of the atmosphere, hydrosphere, and biosphere.

 2. Theories of the Origin of the Universe

- **Big Bang Theory**:

  - The most accepted theory explaining the origin of the universe.

  - States that the universe began 13.8 billion years ago from an extremely hot and dense point.

  - The universe has been expanding ever since.

  - Evidence includes cosmic microwave background radiation and the redshift of galaxies.