The mT air masses pictured here originate
A. over water, are unstable, and bring warm air during the winter.
B. over land, are stable, and bring cold air during the summer.
C. over water, are stable, and bring cold air during the summer.
D. over land, are unstable, and bring warm air during the winter.
Answer: A
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Scientific hypotheses differ from scientific theories in that they are
a. widely accepted descriptions of what we find happening over and over in nature b. tentative explanations that need further evaluation c. not subject to proper investigation and testing d. arrived at after extensive mathematical modeling e. tentative explanations that need further evaluation and not subject to proper investigation and testing
How does the modern global climate compare with that of 400,000 and 800,000 years ago? How do we know?
What will be an ideal response?
This figure shows the geologic timescale. Which period listed below would be part of the Paleozoic?
A) Neogene
B) Paleogene
C) Jurassic
D) Triassic
E) Cambrian
The deepest trenches in the world exceed what depth?
A) 50,000 feet B) 25,000 feet C) 15,000 feet D) 250,000 feet E) 35,000 feet