During the _______________ solstice, the Arctic Circle experiences 24 hours of darkness
Fill in the blank(s) with correct word
winter or December LO1
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The wave of popular uprisings against decades-old dictatorships that began within Tunisia in early 2011 sparked the largest movement of migrants in the world since World War II
Indicate whether this statement is true or false.
Which one of the following is a sedimentary rock?
A) limestone B) rhyolite C) slate D) quartz
Air pollution events are usually associated with low pressure systems
Indicate whether the statement is true or false
Zn2+ is required for a number of proteins. Which of the following describes the complex formed between this ion and the involved proteins?
A) There are six coordinate covalent bonds in the structure. B) Zn2+ as eight d electrons. C) Zn probably does not obey the 18-electron rule. D) The geometry about the zinc ion is tetrahedral.