Calcite and quartz are minerals. What properties do they have in common? How do they differ?
What will be an ideal response?
Common
Transparent
Six-sided crystals
Shiny, glass-like luster
Density
Different
Different shapes of their crystal faces
Different hardness
Calcite has three directions of cleavage, quartz has none
They have different chemical formulas
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The first Europeans to establish a regime in Africa South of the Sahara were the
A. British B. Portuguese C. Spanish D. French
The transfer of heat by molecule-to-molecule contact is:
a. conduction. b. convection. c. radiation. d. ultrasonic.
Which is older - rock unit J or H?
What will be an ideal response?
Which of the following has been cited as a positive feedback loop involving the thawing of permafrost?
A) Thawing of permafrost will release vast amounts of carbon to the atmosphere, accelerating warming. B) Thawing of permafrost will increase albedo, leading to more warming. C) Thawing of permafrost will contribute to sea level rise, which will further reduce overall global albedo values. D) Thawing of permafrost will inhibit frost wedging action on large boulders, altering absorption ability.