The single most important erosional agent on earth is

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah