What causes magnetic stripes on the seafloor, such as those shown here?
A. Volcanic rocks in oceanic crust are covered by a variable thickness of sediment.
B. Some oceanic crust consists of volcanic rocks and some is composed of sediment.
C. Some volcanic rocks are formed in normal ways and others have pillows.
D. Sometimes Earth's magnetic field points north and sometimes it points south.
Answer: D
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Analyze the Big Black River, Mississippi hydrograph shown and answer the questions that follow. Units are CFS (cubic feet per second). How many floods of 50,000 cfs or greater occurred between 1949-1999?
A. 6
B. 7
C. 8
D. 9
If the sun's energy could be measured in units like money, which of the following organisms would be the most expensive to maintain?
A) A mushroom B) A fox C) A squirrel D) A sunflower
Why is color not always a useful property in identifying a mineral?
What will be an ideal response?
An accurate forecast ____
A) always shows skill B) may or may not show skill C) never shows skill D) requires complex computer equipment