The United States and Canada have always been in strong agreement on critical aspects of economics and trade issues
Indicate whether the statement is true or false
F
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Metallic ore deposits are most likely to form when ____
a. small-scale motions of hot spots alter cratonic rocks b. continents rift apart. c. plants decompose in anaerobic conditions d. plants decompose in aerobic conditions e. metals are precipitated from and concentrated by cooling magma
What are the most common triggering mechanisms for mass movement?
a. Earthquakes b. Excessive water from a winter snow melt or a heavy rain storm c. Deforestation d. Both a and b
Volcanoes formed from silica-rich magma
A) have gently sloping surfaces that give them the appearance of a shield. B) are highly explosive and dangerous. C) are associated with midocean ridges. D) are associated with rift zones.
Light is emitted as an electron transitions from a higher energy state to a lower energy state. How long does it take for the actual transition to take place?
A. several seconds B. several nanoseconds C. several microseconds D. no time at all