Describe the four less-common types of lightning
What will be an ideal response?
Answer: Ball lightning: Ball lightning appears as a round, glowing mass of electrified air, up to the size of a basketball, that seems to roll through the air or along a surface for 15 seconds or so before either dissipating or exploding. St. Elmo's fire: Ionization in the air—often just before the formation of cloud-to-ground lightning—can cause tall objects such as church steeples or ships' masts to glow as they emit a continuous barrage of sparks. This often produces a blue-green tint to the air, accompanied by a hissing sound. Sprites: Sprites are very large but short-lived electrical bursts that rise from cloud tops as lightning occurs below. Blue jets: Blue jets are upward-moving electrical ejections from the tops of the most active regions of thunderstorms.
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Carbon dioxide concentrations in the atmosphere have been increasing steadily since the beginning of the industrial revolution and may double by the middle of the next century. Why is this of concern?
What will be an ideal response?
What is the maximum age limit for radiocarbon dating of fossils?
A)70,000 years B)700,000 years C)7 million years D)70 million years E)700 million years
Runoff moves overland via ____
A)sheet flow only B)channel flow only C)laminar flow only D)sheet and channel flow E)laminar, channel flow
An increase in the chlorophyll a content of a seawater sample with time yields a measurement of ________.
A. gross production of organic carbon B. plant respiration C. change in the species of phytoplankton in the sample D. decomposition of plant cells E. net production of organic carbon