Answer:establishment of diasporic merchant communities
Explanation:
All others are wrong
Answer:
read the passage
Explanation:
the passage has the answer
Answer:
Hydrogen could become a future energy source as it can be used to create steam, electricity and other forms of energy. Hydrogen is also considered a clean form of energy, as its only product is water, which is harmless.
Explanation:
Answer:
Option A
Explanation:
The green houses gases concentration increases in the the troposphere layer of the atmosphere due to which the sunrays (IR radiation) reflected back by earth are restricted by the green house gases thereby increasing the temperature of the earth and make the climate warmer.
Hence, option A is correct
