What kind of sand is on white-sand beaches? Black-sand beaches? Give some details about each type
What will be an ideal response?
Answer: Many white-sand beaches contain mostly quartz. Quartz is abundant in river sediment delivered to the sea because it is the weathering-resistant mineral that is most abundant in continental rocks. Quartz also lacks cleavage, so continuous movement and abrasion by waves do not easily break it. Black-sand beaches are common on basaltic volcanic islands. Basalt does not contain quartz to produce white sand, but the fine-grained igneous rock is crushed into small sand-size grains by wave erosion along the shore.
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What evidence is there for an emergence of Stage 5 of the epidemiologic transition?
What will be an ideal response?
A finely crystalline or glassy igneous texture indicates that
A. the rock broke apart as it flowed. B. the rock cooled slowly. C. there was a lot of gas in the magma. D. the rock cooled quickly. E. the ash and pumice were hot and became compacted.
Australia and New Zealand are described as at the "opposite side of the world" from England. If London's centroid coordinates are 51.5O N 0.13O E, and the coordinates for Wellington, NZ are 41.3O S 174.8O E, we can conclude
A. that the statement is false since the antipode of London is in the Indian Ocean. B. that the statement is fairly accurate, but not precise. C. that Wellington really is the exact antipode of London. D. that if you dug a hole straight down from London, you would come out in China.
All of the following are oil rich countries except
A. Yemen B. Saudi Arabia C. Iraq D. United Arab Emirates