In temperate waters, the timing of the phytoplankton bloom is influenced by ________.
A. stability of the water column
B. zooplankton abundance
C. inorganic nutrient concentrations
D. light intensity
E. All of these are correct.
Answer: A
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The present-day magnetic polarity of the Earth is called ____________________. What will be an ideal response?
The symmetrical pattern of magnetic polarities about spreading ridges in oceanic crust basalts
indicates that:a. each plate has had an independent set of magnetic reversals. b. basalt retains its magnetic signature for only a few million years. c. new ocean crust is created by volcanism at oceanic ridges and old crust moves laterally away from the ridge. d. the oceanic crust is geologically young. e. magnetic polarity reverses but northern and southern hemispheres do not.
Formaldehyde has the chemical formula CH2O. How many nonbonding electrons must be shown in the Lewis structure of formaldehyde?
A) 0 B) 4 C) 8 D) 12
An electron orbiting a hydrogen atom
A) is restricted to a single energy state. B) cannot be removed from that atom unless that atom combines with another hydrogen atom to form a hydrogen molecule. C) has greater energy when it is further away from the nucleus. D) can absorb and emit photons of nearly any wavelength.