When settlers arrived in parts of north america in the 1600s, feeding relationships similar
to those shown in the diagram below would have been common. the arrows point from
the organisms being eaten to the organisms that eat them
settlers killed many of the mountain lions and wolves because they thought that they
were dangerous to their farm animals and to their families. a few years later, settlers
noticed that there were a lot more deer. using only the relationships between the plants
and animals described above, what could explain why the deer population increased?

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.