Over years, minerals build up to create rocks. There are three types of rocks; igneous, sedimentary, and metamorphic. Igneous rocks are rocks that form from lava. Sedimentary rocks are formed from particles called sediments. Metamorphic rocks are igneous rocks and sedimentary rocks combined.

The speed of light is 300,000 km per second. The speed of sound is different depending on what material it is traveling through.

300,000 km per hour.

Because there are chemicals that are in heroin.