The introduction of therapeutic drugs and community-based treatment programs in the helped to empty large mental hospitals as well as mark an era of improved treatments. 1940s 1970s 1950s 1960s

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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.