Parts of many mountain systems are made up of small, accreted lithospheric blocks that clearly originated elsewhere. What are these accretions called and what are they made of?
These accretions are called terranes and are fragments of seamounts, island arcs, and small pieces of continents that were carried on oceanic plates that collided with continental plates, thus adding them to the continental margins where mountain building was occurring.
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How did Vine and Matthews relate the seafloor-spreading hypothesis to magnetic reversals of the Earth's poles?
a. New crust created at a transform fault recorded high magnetism during periods of normal polarity and low magnetism during periods of reversed polarity. Older crust of alternating magnetism is pushed away from the ocean ridge as new crust is created. b. New crust created at an ocean ridge recorded high magnetism during periods of normal polarity and low magnetism during periods of reversed polarity. Older crust of alternating magnetism is pushed away from the ocean ridge as new crust is created. c. New crust created at an ocean ridge recorded low magnetism during periods of normal polarity and high magnetism during periods of reversed polarity. Older crust of alternating magnetism is pushed away from the ocean ridge as new crust is created. d. New crust created at an ocean ridge recorded high magnetism during periods of normal polarity and low magnetism during periods of reversed polarity. Newer crust of alternating magnetism is pushed away from the ocean ridge as new crust is created. e. New crust created at deep-sea trench recorded high magnetism during periods of normal polarity and low magnetism during periods of reversed polarity. Older crust of alternating magnetism is pushed away from the ocean ridge as new crust is created.
Because of human ________, there is ample reason to hope that we may achieve sustainability before doing too much damage to our planet and to our own future prospects
A) ingenuity B) consumption patterns C) "affluenza" D) rationalization E) procrastination
With the Sun and Moon in this position, the side of the Earth facing the Moon experiences
A) a normal high tide.
B) a normal low tide.
C) a spring tide.
D) a neap tide.
Which of the following produces a tidal current?
A) Both ebb tides and flood tides B) Both neap tides and spring tides C) Ebb tide D) Flood tide E) Spring tide