Group 8A of the periodic table was once known as the inert gases, but is now known as the noble gases. Which of the following resulted in the change of name?
A) Once there were no known compounds of these elements, but now many compounds of all of the noble gases are known.
B) Once there were no known compounds of these elements, but now a few compounds of some of the noble gases are known.
C) These elements form no compounds and are extremely expensive.
D) The elements only react with noble metals such as gold and platinum.
B
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If the earth and it's atmosphere were reduced to the size of an apple, the atmosphere
A) would be about 1/1,000,000 as thick as the apple's skin B) would be about 100 times thicker than the apple's skin C) would be about 1/100 as thick as the apple's skin D) would be about as thick as the apple's skin
What research vessel carried out the first large-scale plankton study?
A) Meteor B) HMS Challenger C) HMS Beagle D) HMS Discovery
Which of the following is CORRECT regarding waves that travel in wave trains?
A) They are called breakers as they travel in the open sea. B) They experience refraction by the deep seafloor. C) They are produced in stormy areas far distant from the shores where they may finally break. D) They usually form relatively close to the affected coastline.
An occluded front forms part of which of the following?
A) A cold front B) A warm front C) A stationary front D) An extratropical cyclone E) A dry line