Which of the following is not associated with biological weathering?
A) Expansion of rock cracks by tree roots
B) Flaking of rock particles because of lichens present
C) Leaching of nutrient minerals from rocks
D) Disintegration of rock by burrowing animals
E) Formation of rock joints
Answer: E
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Cinder cones typically ____
a. have several fissures b. erupt as lava flows c. are composed of tephra d. form the largest type of volcano
____________ provides educational and clinical services to help couples choose how many children to have and when to have them.
Fill in the blank(s) with the appropriate word(s).
Which of the following is the most strongly supported by extensive hypothesis testing?
A) observation B) educated guess C) theory D) hypothesis E) speculation
By which century had agriculture spread widely throughout the Old World and much of the New World?
A) 1300 AD B) 1400 AD C) 1500 AD D) 1600 AD E) none of the above