Talc and graphite are two of the lowest minerals on the hardness scale. They are also described by terms like greasy or soapy. Both have a crystal structure characterized by sheet-structures at the atomic level, yet they don't behave like micas
What accounts for their unusual physical properties?
The chemical bonds between the sheets is so weak that very low stresses can allow slip between the sheets; hence, the greasy feel and low hardness.
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The mass extinction in the geologic record which proved to be most devastating to life on Earth
occurred at the end of the
a. Cambrian.
b. Cretaceous.
c. Devonian.
d. Ordovician.
e. Permian.
The ocean's total biomass is concentrated primarily in the uppermost ____________ meters. Fill in the blank(s) with the appropriate word(s)
Saguaro cactus, organ pipe cactus, and elf owl are all examples of species ________ to MexAmerica
Fill in the blank(s) with correct word
The UV index ranges from ________
A) 1 to 100 B) 100 to 1,000 C) -10 to 10 D) -100 to 100 E) 1 to 11 or greater