Geology of Gems: Formation, Types,
And Localities Exam Questions With
Correct Answers
/. What are the three main regions of the Earth? - Answer-✅The core, mantle, and
crust.
/.What is the composition of the Earth's core? - Answer-✅Mostly iron, making up more
than one tenth of the Earth's volume.
/.What is the mantle primarily composed of? - Answer-✅Crystalline, iron-rich rock, over
eight-tenths of the Earth's volume.
/.What is the Earth's crust made of? - Answer-✅Solid granite and other rocks, and is an
extremely thin layer compared to the Earth's diameter.
/.How thick is the continental crust? - Answer-✅Varies from 25 to 70 km and is thicker
and less dense than oceanic crust.
/.What is economic geology? - Answer-✅The study of materials extracted from the
Earth for use and industry, including gem extraction.
/.What are the three types of rocks? - Answer-✅Igneous, metamorphic, and
sedimentary.
/.What are igneous rocks? - Answer-✅Rocks that have solidified from magma or molten
rock, making up 95% of the Earth's crust.
/.What controls the melting of solid rock to form magma? - Answer-✅Temperature,
pressure, and composition.
/.What are extrusive igneous rocks? - Answer-✅Rocks formed when magma erupts and
crystallizes rapidly at the Earth's surface.
/.What are intrusive igneous rocks? - Answer-✅Rocks formed from magma that cools
slowly below the Earth's surface, allowing larger crystals to form.
/.What are pegmatites? - Answer-✅Intrusive igneous rocks that can contain large
transparent crystals and valuable gemstones.
And Localities Exam Questions With
Correct Answers
/. What are the three main regions of the Earth? - Answer-✅The core, mantle, and
crust.
/.What is the composition of the Earth's core? - Answer-✅Mostly iron, making up more
than one tenth of the Earth's volume.
/.What is the mantle primarily composed of? - Answer-✅Crystalline, iron-rich rock, over
eight-tenths of the Earth's volume.
/.What is the Earth's crust made of? - Answer-✅Solid granite and other rocks, and is an
extremely thin layer compared to the Earth's diameter.
/.How thick is the continental crust? - Answer-✅Varies from 25 to 70 km and is thicker
and less dense than oceanic crust.
/.What is economic geology? - Answer-✅The study of materials extracted from the
Earth for use and industry, including gem extraction.
/.What are the three types of rocks? - Answer-✅Igneous, metamorphic, and
sedimentary.
/.What are igneous rocks? - Answer-✅Rocks that have solidified from magma or molten
rock, making up 95% of the Earth's crust.
/.What controls the melting of solid rock to form magma? - Answer-✅Temperature,
pressure, and composition.
/.What are extrusive igneous rocks? - Answer-✅Rocks formed when magma erupts and
crystallizes rapidly at the Earth's surface.
/.What are intrusive igneous rocks? - Answer-✅Rocks formed from magma that cools
slowly below the Earth's surface, allowing larger crystals to form.
/.What are pegmatites? - Answer-✅Intrusive igneous rocks that can contain large
transparent crystals and valuable gemstones.
