The correct answer is letter A. Viscosity. A factor that determines the composition of magma is through it's viscosity. Viscosity is affected through the amount of dissolved gases in the magma, but in a more ambiguous way than silica content and temperature.
Answer:
Plant growth
Explanation:
Planting plants will reduce weathering because the plant will hold the soil firmly through its roots.
Answer:
Let's take, Michigan 200 million years ago. Average carbon dioxide levels would have been 1850 parts per million which means that global temperatures would average 3 degrees warmer than today. Michigan was positioned between the cold sea current to the west and mountain ranges to the east (as tall as the Himalayas are today). So the climate in Michigan at this time must have been an extremely arid desert.
Explanation:
Artificial Boundaries, because countries are way more likely to dispute and fight wars over this type of boundary, than natural boundaries <span />