A relatively large and randomly oriented grains constitutes the rock

Limestone's are very rich in

A. calcium

B. carbonate

C. calcium carbonate

D. magnesium carbonate

A rock which has been transformed from shale is

A. slate

B. marble

C. gneiss

D. quartzite

A crystalline or glassy rock formed when magma or lava cools down and solidifies is called

A. sedimentary rocks

B. metamorphic rocks

C. igneous rocks

D. morphic rocks

Obsidian is rich in

A. silica

B. iron

C. cobalt

D. calcium

Marble is transformed from

A. sandstone

B. limestone

C. igneous rock

D. shale