Travels faster through a liquid than through a solid
O
light
O
sound
O
light and sound

i don't know. if i were you, i would search it up online : d

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.