Why is the statement, “The Jurassic system lasted from 200-146 million years ago,” incorrect? How would you correct
it? In your explanation, be sure to distinguish between time-stratigraphic units and time units. What will be an ideal response?
This statement is incorrect because it confuses time-stratigraphic units with time units. The
Jurassic PERIOD was from 200-146 million years ago. The Jurassic system includes the all
the rocks that were deposited over the Jurassic period.
Time-stratigraphic units include all rocks deposited in the indicated time unit. Time units, in
contrast, include all of the time between time unit boundaries.
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What characterizes the first stage (preindustrial) of the demographic transition model?
a. high birth rates and high death rates resulting in negligible population growth b. high birth rates and low death rates resulting in high population growth c. low birth rates and low death rates resulting in negligible population growth d. low birth rates and high death rates resulting in declining population growth e. high birth rates and low death rates resulting in declining population growth
Where is the world's largest glacier located?
A) Greenland B) Asia C) Antarctica D) Minnesota
Tilted retaining walls are a sign of a landscape undergoing creep
Indicate whether this statement is true or false.
The most abundant mineral group within the Earth's crust and mantle is ____________
a) Oxides b) Carbonates c) Sulfides d) Halides e) Silicates