Convection currents occur in the MANTLE. The mantle is the second layer of the earth after the crust. The mantle is approximately 2900 km thick. Convection currents are triggered or fueled by the heat from the Earth's core.
The part of the mantle closest to the core gets heated. It then becomes less dense than the layers above so it rises. When this rising plume interacts with the crust it cools and becomes more dense than the layers below and so it sinks and this circular motion continues to form convection currents.
The earth's physical features affects people's activities by places. Many mountains are been attracting tourists as they are coming and enjoying the beautiful sceneries and enjoy activities by Snow -boarding rock climbing bird watching etc.Trees as well affects the human activities by producing paper and oxygen.
I would think that it is true bit in not sure
<h3>Subsistence farming, form of farming in which nearly all of the crops or livestock raised are used to maintain the farmer and the farmer's family, leaving little, if any, surplus for sale or trade. Preindustrial agricultural peoples throughout the world have traditionally practiced subsistence farming.</h3>
Answer:
Low birth weight are more frequent at high altitude
Explanation:
From research that has been conducted overtime it has been established that birth weight declines with an increasing altitude. High altitude causes a reduction in birth weight compared to those who live at sea level. Babies born on high altitude could be about some ounces lighter than those that are born at sea level. On the average as altitude rises by about 3,300 feet, fetal weight reduces by about 3.5 ounces.
