A lens produces a real image by causing light rays from a common point to 1.) coverage and intersect at a point 2.) disperse into component wavelengths 3.) reflect constructively 4.) diverge and appear to come from a point

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

3. dark matter

empty space could also be a simple vacuum

answergravity;

gravitational energy

electrical energy

kinetic energy

ligh energy