In order for limestone to collapse to form a major sinkhole, the ground above must be ____
a. ?thin and porous so that rainwater passes through easily
b. ?small-grained so the soils can percolate through fissures
c. ?thick and rich in cohesive clay to allow a cavern to form
d. ?high in peat, allowing decomposition in the presence of oxygen
e. ?acidic, to speed the dissolution process
ANSWER: c
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The inner core is solid because
A) it is composed of iron and nickel. B) the surrounding outer layers act as a blanket to insulate the core. C) pressure from the weight of the surrounding layers prevents the inner core from melting. D) None of these, for the inner core is not solid, but liquid.
Basalt and granite are examples of ____________ rocks. Fill in the blank(s) with the appropriate word(s)
Which statement correctly describes hunting and gathering?
A) All humans obtained their food this way before the invention of agriculture. B) It is a form of nomadism. C) This form of subsistence is still practiced. D) Hunter gatherers live in small groups. E) All of these are true.
Which type of tool is a pick-head axe?
a. combination b. cutting c. prying d. striking