Halos are most often observed in the ____________ time of the year
a. spring b. summer
c. fall d. winter
d
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Process of Science: Give a scientific explanation of the success of the central African rainfall-prediction technique of observing the waxing crescent Moon. Can the Moon cause a change in rainfall? Or vice versa?
What will be an ideal response?
The mass of an electron and its antiparticle, a positron, is 0.511 MeV/c2 . In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because __________
Fill in the blank(s) with correct word
Earth's magnetic field is a direct result of its rapid rotation and its molten metallic core
a. True b. False Indicate whether the statement is true or false
Complete the following sentences that describe evidence found in the K-T boundary layer. Drag words at the left to the correct blanks in the sentences at the right.
A. The presence of soot suggests that there were world-wide forest fires at the time this layer formed. B. The presence of solidfied rock "droplets" is thought to indicate that rock splashed upward by an impact was molten as it fell back down from the sky. C. The presence of shocked quartz suggests an impact because these mineral grains form only under high-pressure conditions. D. The unusually high abundance of iridium in this layer suggests that this material came from the impact of an asteroid (or comet). E. All of the above.