Important Questions Answers From Earth and Univers|| Class 8 || Science

 

Important Questions Answers From Earth and Univers 

Dinosaur Era 

#Sciencequestionanswer important 

#Earthanduniverse #Whsta is minerals, #Dinasourera #era #Earth 

Alle the Questions are very important from the point of view of examination; 

1. Answer the following questions:

a) What are minerals? Give examples.

=> Minerals are substances obtained from mines and hold economic value. Examples include coal, petroleum, limestone, etc.

b) What are the hypotheses regarding the origin of Earth? Explain one of them.

=> The hypotheses regarding the origin of Earth are as follows:

• Nebular Hypothesis
• Planetesimal Hypothesis
• Binary Hypothesis
• Tidal Hypothesis

The Tidal Hypothesis: British scientists Sir James Jeans and Harold Jeffreys proposed this hypothesis in 1919 Ad . According to it, a large star once passed close to the Sun at high speed, and due to its gravitational pull, tidal flares emerged from the Sun Called filament. These later cooled and formed various planets and satellites.

c) Describe the importance of minerals in Nepal.

=> The importance of minerals in Nepal is as follows:

• In Agriculture: Minerals play a vital role in agriculture; they help improve soil fertility and increase agricultural productivity.
• In Industry: Minerals serve as raw materials for industries, which use them to produce various industrial products, hence highlighting their significance in the industrial sector.
• In Construction: Minerals like stone, clay, and sand are used in construction for building houses, bridges, roads, etc., demonstrating their importance in construction.
• In Energy: Minerals like coal, graphite, petroleum, and gas are used as sources of energy.

d) Which era is called the unfavourable era for the origin of life, and why? Explain with examples.

=> The Mesozoic Era is also known as the unfavourable era for the origin of life because, during its last period, the Cretaceous Period, extreme meteor showers, volcanic eruptions, and other events caused the environment to become toxic. This led to the extinction of many species, including dinosaurs, which is why this era is considered unfavourable for the origin of life.

e) When did the large-toothed mammoth and lungfish originate?

=> The large-toothed mammoth and lungfish originated during the Paleozoic Era.

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