No wrong answers.
the color of the powder that a mineral leaves on a piece of white, unglazed porcelain is called the mineral's luster.
a. true
b. false

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures