Although gyres flow continuously, oceanographers categorize them into four interconnected currents. Indicate whether the statement is true or false
ANS: T
The main reason gyres are split up is because each current has very distinctive temperatures and
characteristics. There are western boundary currents, eastern boundary currents, and transverse
currents. Information can be found in the section Surface Currents Are Driven by the Winds.
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Photosynthetic plankton are called phytoplankton and include the diatoms and dinoflagellates
Indicate whether the statement is true or false
Less-developed countries generally have high population growth rates because birth rates are high and death rates are low.
Answer the following statement true (T) or false (F)
Igneous rocks with a texture that is so fine-grained that the crystals are too small to see is:
a. aphanitic. b. porphyritic. c. glassy. d. phaneritic. e. pyroclastic
What is the name the physical feature in this diagram, marked with an arrow?
A) Submarine canyon B) Deep-ocean basins C) Abyssal plains D) Rift valley