19. A stone has a mass of 390 g and a density of 2.7 g/cm3. Cooking oil has a density of 0.90 g/cm².
Which mass of oil has the same volume as the stone?
A 130 g
B 160 g
C 900 g
D 1200 g
(Show the working)

Gunpowder residue is most likely to show up where on a shooters hands

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

The mantle is made up of which structural zones?