The crater at Crater Lake was formed by
A. the erosion of ash and cinders from a circular basin filled with pyroclastics.
B. collapse of overlying rocks into an emptied magma chamber.
C. an asteroid impact.
D. formation of a large sinkhole over a collapsed limestone cavern system.
Answer: B
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Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?
A. Less. The individual nucleons have greater mass when separated from the nucleus. This additional mass is a result of the energy of separation. B. Neither. The mass of the atomic nucleus is exactly the sum of the masses of the nucleons. C. Greater. The mass of the atomic nucleus also has mass of the "atomic glue" that holds the nucleons together in the nucleus. D. Greater. We need to add the masses of the surrounding electrons to the masses of the nucleons.
Compare and contrast national environmental organizations, radical groups, and NGOs.
What will be an ideal response?
You have downloaded from the Internet an elevation raster, which has values ranging from 94.7 to 2409.1 meters. But, for your project, you need a new integer raster with elevation values grouped into five classes: 1 (0-500), 2(500-1000), 3(1000-1500), 4(1500-2000), and 5(2000-2500). Describe how you can complete the task.
What will be an ideal response?
Which is NOT a disadvantage of coal mining?
A. black lung disease B. dioxin pollution C. acid deposition D. acid mine drainage