If a mineral has a metallic shine to it, which property of a mineral is being measured? a streak/b cleavage/ c color/d luster

An enzyme lowers the energy of activation. what does that mean?

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation