A student is preparing a sugar water solution to make rock candy. When the student adds some sugar to the solution a large amount of sugar crystallizes. Which kind of solution does the student have?
A) a saturated solution
B) a supersaturated solution
C) an unsaturated solution
D) We cannot tell.
B
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________ is the major gas in the atmosphere of Venus
Fill in the blank(s) with correct word
Matching
1. On the atmospheric layers figure, choose the letter that represents the boundary in the atmosphere between the troposphere and the stratosphere. 2. On the atmospheric layers figure, choose the letter that represents the area where air would be thin and temperatures vary greatly with solar activity. 3. On the atmospheric layers figure, choose the layer that contains ozone, which keeps approximately 95% of the sun's ultraviolet radiation from reaching the Earth's surface. 4. On the atmospheric layers figure, choose the layer that represents the separation of the mesosphere and stratosphere. 5. On the atmospheric layers figure, choose the layer that represents part of the middle atmosphere in which temperatures vary greatly with altitude.
From this cross section of the Grand Canyon, the oldest rocks or structures are the
A) Late Cenozoic basalts.
B) Mesozoic sedimentary rocks.
C) Precambrian sedimentary and igneous rocks.
D) Precambrian metamorphic rocks and granite.
E) Hurricane fault and faults along the Grand Wash Cliffs.
Geomagnetic reversals________________________
a) provided strong evidence for seafloor spreading b) caused all the mass extinctions in recorded geologic history c) destroyed compasses ane electronic equipments d) confirmed the existence of subduction zones e) cause the movements of plates