The theory of plate tectonics helps to explain O how ocean currents move over Earth's surface
O why hurricanes and tornadoes occur
O why Earth's mantle is more dense than its crust
O how earthquakes and volcanic eruptions occur

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.

Low areas cut into a gun barrel are called