How does density play a role in the plates movement? (subject: science)

hello there,

igneous rock formed from below the surface would have more crystals because

answer: because magma cools more slowly than lava

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.