Answer:
Generally they are divided into the following categories: small towns-up to 10,000 inhabitants, 10,000-20,000, and 20,000-50,000; medium-size cities, 50,000–100,000 inhabitants; and large cities- 100,000-300,000 and 300,000-1,000,000 inhabitants.
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Volcanologist specialize in the study of Volcanos.
Seismologists specialize in the study of siesmic waves .
Answer:
Various advantages and disadvantages are given as under
Explanation:
<u>Pros</u>:
- As Genetically modified crops are genetically disease resistant they have been proven safe through testing and use.
- They increase the nutrient contents and reduce the worldwide hunger levels, also lower prices of food.
- They lead to environmental benefits such as reduced pesticides use and lower carbon emissions
<u>Cons</u>:
- They have not been proven safe for human consumption through trials.
- Genetically modified crops can lead to the development of various food allergies in the body.
- Increased use of toxic herbicides and pesticides damages soil fertility.
Answer:
Atmospheric pressure differs in different parts of the world.
Explanation:
- This is because atmospheric pressure depends on the height of a particular location on earth.
- A number of locations on the earth are at sea level. The atmospheric pressure at sea level is 14.7 pounds per square inch.
- At higher levels (altitudes) the atmospheric pressure is lower since higher places have got less air pushing downwards compared to lower altitudes which have more air pushing down and hence, high atmospheric pressure.
