Answer:
Photosynthetic organisms was the reason of these atmospheric changes.
Explanation:
The plant which is discovered by the scientists that is apparently devoid of life but has ice caps located at the poles which reveals that planet's atmospheric O₂ levels sharply increased about 1,000,000 years ago was due to evolution of photosynthetic organisms like cyanobacteria etc which went extinct and then O₂ levels dropped quickly 50,000 years ago. So photosynthetic organisms was the reason of these atmospheric changes.
Answer:
The word underlined in the sentence is best defined as activity.
<em>"Each economic </em><em><u>activity</u></em><em> play the vital role in the nation's economy".</em>
Explanation:
An economic sector is one in which a good is produced and exchanged for another good or for money, generating the flow and distribution of wealth in a given population.
Economic sectors involve each of the activities that generate goods and services to meet the needs of a population and generate wealth, being the main activities -or sectors- of the economy:
- Farming / fishing.
- Agriculture.
- Industry and commerce.
- Communications.
- Diverse services provided by qualified or unqualified personnel.
Each one of the economic activities that are carried out in a country contribute to cover the requirements of the population, at the same time that they constitute the economy of this country.
One of the most destructive hazards associated with composite volcano eruptions are super-heated gases called pyroclastic flows.
<h3>What are pyroclastic flows?</h3>
The pyroclastic flows are harmful mixtures of warmed rocks and gases released during volcanic eruptions.
These pyroclastic flows are very harmful because they reach very high velocities (up 710 km per hour).
In conclusion, one of the most destructive hazards associated with composite volcano eruptions are super-heated gases called pyroclastic flows.
Learn more about pyroclastic flows here:
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Answer:
Corruption
Explanation:
An abundance of natural resources don't always equate to wealth. Japan for example has few natural resources but is high in human capital.
Countries with gold mines might not be the richest possibly because of corruption, exploitation, and conflict.
This video might be of some help to you: "Why Some Countries Are Poor and Others Rich"
