Question

The metamorphic rock marble will dissolve in the presence of a weak acid. Which rock probably was changed into marble by the addition of heat and pressure?
A.) shale
B.) sandstone
C.) granite
D.) limestone

to which of the 6 crystals systems does a halite crystal (rock salt) belong?
A.) tetragonal
B.) orthorhombic
C.) monoclinic
D.) cubic

Answer 1

1. The correct answer is option D, that is, limestone.  

Limestone is mainly composed of calcite and the associated mineral dolomite. It is the calcite that gets dissolved in the presence of weak acid, and it is the limestone that changes into marble with the application of heat and pressure.  

2. The correct answer is option D, that is, cubic.  

The rock salt or halite, crystallizes into the isometric or cubic crystal system.  

Answer 2

D. limestone

D. cubic