What is the gradient of a stream? What will be an ideal response?
Stream gradient is the slope over which the stream flows, the vertical drop through which the stream
moves divided by the horizontal distance the water moves.
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What is the approximate population of Southwest Asia and North Africa?
A) 100 million B) 200 million C) 500 million D) 700 million E) 1 billion
How is it possible for a neutral molecule, such as water, to form an ion?
A) It can combine with a hydrogen ion to form a positively charged species. B) It can combine with a chloride ion to form a negatively charged species. C) It can fragment into protons and electrons. D) It can absorb electrons and become negatively charged. E) It can absorb electrons and become positively charged.
Lobe-finned fish are important in the fossil record because it is believed that these fish eventually gave rise to
amphibians. a. True b. False
True or False: All clay-mineral grains in a clastic sedimentary rock are clay size
Indicate whether this statement is true or false.