What is the modern explanation for what the ancient Chinese called “guest stars”?

Scientists infer that chemical weathering of crustal rocks is not the only source of some minerals, such as chlorine, bromine, sulfur, and boron because ________.

When electrons are shared amongst all atoms, the resulting bond is a(n) ________ bond.

The 5000 year old Stonehenge stone circle of Salisbury Plains, England, allows light shafts to come straight between two rocks on ________ in the Northern hemisphere.

What type of volcanos are the Earth’s largest?

List the two most common rock forming mineral groups.

Describe the cleavage of calcite. Include the number of directions and degrees of cleavage angles.

Which figure (A or B) illustrates the cleaved sample of fluorite?  

For magnetite, list one diagnostic property that can help distinguish this mineral from others.

Name the physical property (hardness, color, streak, etc.) described by the following statement. Breaks along smooth planes