Mixtures of sand and clay develop strength by:
a. friction between grains
b. attractive forces between particles
c. both a and b
d. neither a nor b
c
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What is the source of high carbon dioxide levels at middle depths in the ocean?
A) The decay of the remains of organisms B) It diffuses from the atmosphere C) Chemical reactions D) Plant respiration
Evidence that tensile stresses are actively pulling the lithosphere apart in an ocean ridge system is given by ________
A) the width of the ridge system B) the lack of thick sediments on the ridge system sea floor C) the existence of a rift valley in a ridge system D) the height of the ridge system
The climate of a large state or a small nation is called the ____________________
Fill in the blank with correct word.
The Earth is one of ________ planets in the solar system
A) four B) eight C) twenty D) thirty six E) over one hundred