Answer:
Migration rates affect populations because more people can come into one single country increasing the population. This can also cause secondary effects with no enough healthcare and or work available.
Explanation:
Answer: 9 (in square units)
WORKINGS
Base of Triangle, b = 2√3
Height of Triangle, h = 3√3
Formula for Area of Triangle, A = (b * h)/2
Area of the Triangle = (2√3 * 3√3)/2
= (2 * √3 * 3 * √3)/2
Collect like terms in the bracket
= (2 * 3 * √3 * √3)/2
= [(2 * 3) * (√3 * √3)]/2
= (6 * 3)/2
= 18/2
= 9 (In square units)
The correct answer is - A. replacing natural vegetation with cultivated crops.
The natural vegetation is perfectly adapted to a certain environment, and it is also able to keep the soil tight with its roots, so the erosion is minimal.
When the natural vegetation is replaced by cultivated crops, than a problem occurs in the erosion of the soil. That is because the cultivated crops, in general, do not have root systems that are as strong and widespread as the natural vegetation, thus the soil becomes loosened up, so it is much easier to be eroded.
Rapid cooling can be caused when the atmosphere has too much oxygen in it.
Fresh water and salt water together cover 3/4 of the earth's surface.
