Which of the following materials does sound travels faster in? A. Pure water b. salted water c. unpolluted air d. polluted air

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.