I believe the answer is: Sheet metal
Self tapping screws are made by creating a gap in the connector within the thread of a crew, which creates a flute and cutting edge just like what we see on tap. This makes self tapping screws able to tap their own hole in a sheet metal while normal screws can't.
To surrender is another word for <u>to give up</u>.
<span>14) Waldo is in the West Bank. The West Bank is predominately Arab, but Israel has been building Jewish settlements there.
15) Waldo is in Turkey. The </span><span>Tigris and Euphrates Rivers empty into Turkey, Iraq, and Syria. However, since Iraq and Syria aren't among the answer choices, it's Turkey. </span><span>
16) Turkey built the dams.
17) Jordan has a water shortage and it's north of Saudi Arabia.
20) Waldo is talking to Kurds. Syria and Turkey have large Kurdish populations. In fact, Kurds make up 18% of the population in Turkey.
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Hope this helps.