Question

Define the following terms:

1. Laurentia

 2. North Environmental crises 

3. Global warming 

4. Galaxy 

5. Universe 

6. Solar system

Answer 1

1. Laurentia: The break-up part of the Pangaea that consists of present 
2. North Environmental crises: Global warming and poisoning of our soils, water, and air are called environmental crises. They are caused by the reckless exploitation of the earth by humans.
3. Global warming: Global warming is the rise in the average temperature of the Earth’s atmosphere and oceans. 
4. Galaxy: Galaxies are composed of stars, dust, and dark matter all held together by gravity.
5. Universe: The totality of matter, energy, and space including the solar system, the galaxies, and continents of the space between the galaxies. 
6. Solar system: The solar system is made up of all the planets that orbit the sun. In addition to planets, the solar system also consists of moons, comets, asteroids, minor planets, and dust and gas.