Cloud droplets are rarely able to grow through condensation beyond a radius of 20 micrometers because:
A) the supply of water vapor is quickly consumed by the many competing droplets.
B) the statement is false - cloud droplets can actually grow much larger.
C) the adiabatic process stops working when condensation begins.
D) the air gets too cold as condensation occurs.
A
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Hydrothermal vents support a community of organisms including pogonophorans, clams, crabs, and worms, just to name a few. But hydrothermal vents are found in the deep-sea far from the photic zone. If no light reaches hydrothermal vents, what is the basis of the primary productivity that supports the community?
The process of ________ explains how warm, less dense air is replaced with cooler, denser air masses.
A) subduction B) conduction C) convection D) invection
On the chart, use the data from Figure 11-2 to plot the altitude of the noon Sun on the 22nd day of each month for the equator, 45° N, and 90° N. Connect the values for each latitude with a labeled line (you may also use a red line for the equator, a green line for 45° N, and a blue line for 90° N). Plot negative angles as a solar altitude of 0°.
Using the completed chart, answer the following questions:
(a) On June 22, at which latitude (the equator or 45° N) is the noon Sun highest in the sky?
(b) Does the noon Sun at the North Pole ever get as high as it is on January 22 at 45° N?
Which of the following is NOT true of dry lands?
A) Deserts generally lack sufficient water to grow crops that could feed a large population B) Dry lands are generally not suited for intensive agriculture but may contain useful natural resources C) Areas too dry for farming cover about 20 per cent of the Earth's surface D) Some animals are adapted to the dry conditions here E) No agriculture can take place in dry lands