The Younger Dryas event tells us that ________
A) ice core samples are unreliable proxy records
B) we have not always fully understood proxy records, since it turns out that what we call the Younger Dryas event actually took place before the Elder Dryas event
C) climate change has not always necessarily been a gradual process
D) the more recent warming trends have typically been associated with unusually dry periods
C
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The movement of sediment (usually sand) along the coast, driven by wave action, is referred to as ____
A) wave reflection B) foreshore current C) longshore drift D) estuarine drift
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.
Deeply buried rock that is hot and under pressure can deform like taffy or putty.
Answer the following statement true (T) or false (F)
The lithosphere is the outer layer of the earth characterized by ________
A) magma B) hard rocks that break C) layers of both hard and soft rocks D) soft rocks that flow easily