What are the possible short-term causes of Ice Ages?
a. Shape of Earth's orbit varies
b. Angle of Earth's axis changes
c. Earth's axis wobbles
d. All of the above
e. Both a and c
Answer: d. All of the above
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The __________ addresses specific targets for reducing the primary six greenhouse gases.
Fill in the blank(s) with the appropriate word(s).
Names given to the different types of igneous intrusions are attributed to their
A) shape and size. B) composition and crystal size. C) location and depth. D) process of formation.
Québec has acted to protect the French language by
A) outlawing other languages in public. B) electing English-speaking leaders. C) accepting only French-speaking immigrants. D) having one of the strongest economies in Canada. E) requiring its use on signs.
Why is talc a slippery mineral whereas quartz is a hard mineral?
a. Quartz is composed of sheet structures, whereas talc is composed of single chain structures. b. Quartz has sheet structures that are held together very strongly by magnesium ions, whereas talc lacks such strong bonds between its sheet structures. c. Quartz only has silicon-oxygen bonds, which are equally strong in all directions, whereas talc is made of sheet structures. d. Quartz is composed of single chain structures, whereas talc is composed of sheet structures. e. Talc only has silicon-oxygen bonds, which are equally strong in all directions, whereas quartz is made of sheet structures.