Geology quiz #5

About how hard are your fingernails on the Mohs Hardness Scale?

2.5

Why is the Earth layered with a gaseous atmosphere, silicate crust, and solid metal core?

The different elements differentiated based on density

Which of the following minerals has ONE plane of cleavage?

biotite

Which of the following minerals effervesces (fizzes) in contact with hydrochloric acid?

calcite

Which is the strongest molecular bond?

covalent

Which one of the following IS a mineral?

graphite (pencil lead)

Which of the following qualities of minerals can we identify with a test?

magnetism

Which of the following is NOT a requirement to be classified as a mineral?

organic

What is the main group of minerals in the Earth's crust and mantle?

silicates

Silicate minerals, like quartz, feldspars, and micas, form what type of crystal structure?

tetrahedron