An important research direction in history of physical activity that began taking shape in the 1980s

History of exercise and health.

Explanation:

The exercise is important for all the individual as it keeps the individual fit and healthy. The different exercise are performed by the different individuals based on their age, sex and strength.

The research related to the physical health and physical activity was started in 1980's. These researches explains the importance of the exercise and the positive relationship between the health and the exercise. The health benefits of the yogas and asanas are started during this time.

Thus, the answer is history of exercise and health.

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.