Mountains: <span>a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill, its a huge pile of dirt.
Hills: </span>a naturally raised area of land, not as high or craggy as a mountain, <span>a sloping piece of road or trail.</span><span>
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The scientists can use a dead plant or dead animal , such as a piece of wood or a bone fragment to provide information that can be used to calculate the time of death in radiocarbon dating.
"the terrorist <span>attacks on the United States" would be the best option from the list since communism was already on the fall and the US had just suffered a terrorist attack in New York City. </span>
- from 1993-2001 she was first lady of the United States
- from 2001-2009 she was US senator in New York
- from 2009-2013 she was Secretary of State
for more information you also can look at her wiki page, but this is just information i knew from my history class last year from our text book
