C. Salts came from erosion of land
A. at the same time that Earth formed
Explanation:
Geologists think the earth's continents began to form about the same time the earth was formed.
Most of the rocks on the continental crust are about the oldest that been used to date the age of our planet.
- Oceanic plates are relatively very young as they are formed at spreading centers and destroyed at convergent margins.
- Continental masses have very high absolute ages.
- The oldest rock on earth such as the Kabala Gneiss have been dated to be about 3 billion years.
- Other rocks have yielded ages close to the formation of the earth.
- We can conclude that the continents began to form immediately after the earth was formed.
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Answer:
Explanation:
<u>Renewable resources</u>
Renewable resources are the ones that can be replenished again and again i.e. they can't get exhausted after the use. On to other hand, non renewable energy resources can't be replenished again and again and can become exhausted after the usage .
For example ,
A) fossil fuel:
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Economically </u>fossil fuels are very cheap and hence widely used in economically poor areas.
Fossil fuels has the adverse effects on environment as their burning releases carbon dioxide in the atmosphere, which is the main reason for global warming.
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Benefits:</u> It is very cheap and hence anyone can afford it. Economies of poor countries are very much dependent on the
They are easily accessible and do not need much of technological advancement or heavy machinery.
<u>2. Solar energy:</u>
<u>
Economical cost</u>: Economically it is very expensive and hence it's usage is limited to rich countries only. Silicon used in it is very expensive.
<u>
Environmental: </u>It is environment friendly and so it is a clean source of energy.
<u>
Benefits:
</u>
In this world of drastically changing global climate, increasing pollution and with highly burdened energy resources, solar energy is turns out to be a Savior. It is pollution free and has unlimited abundance .