Rocks that are melted by heat and then cooled are classified as: igneous sedimentary metamorphic.

Igneous rocks

Explanation:

Igneous rocks are usually defined as those rocks that are formed from the crystallization and solidification of magma. This magma are originated from the interior of the earth as well as the melting of the rocks.This heating of magma occurs due to the increase in the temperature, and when these magma are cooled and hardened, the extrusive and intrusive types of igneous rocks are formed. For example, Granite (intrusive igneous), Basalt (extrusive igneous).

d.) circle motion requires a force to give it a centripetal acceleration.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.