Earthquakes often occur along as a result of the build up of stress a: volcanoes b: ridges c: subduction d: plate boundaries

The least penetrating form of radiation is

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.