What is the cause of the plate tectonic activity? O Solar flares and gravity
O Ocean currents
O All of these
O Convection of liquid metal in the core
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Which accurately compares concave and convex lenses?

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)

Which type of reaction is shown in this energy diagram ?