Please help me find a) and b).

answer; i believe that the correct answer is (d) a very small amount of mass

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

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