popcorn story
Read the passage and answer the guestions.
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Popcorn, also known as popping corn, is a special variety of corn (Zea mays everta). Each kernel contains a tiny drop of vvater. When it is heated, the vvater expands causing the kernel to explode and flip inside out. Most US popcorn is grown in Nebraska and Indiana, and increasingly in Texas.
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"When it is heated, the water expands causing the kernel to explode and flip inside out."
Native Americans first discovered popcorn thousands of years ago in Guatemala or Mexico. It was popped in China during the Song Dynasty (960-279) as well as in Sumatra and India long before Columbus reached the Americas. In 1948 and 1950, anthropologist Herbert Dick and botanist Earle Smith discovered ears of popcorn in the Bat Cave of west central New Mexico. The ears measured from smaller than a penny to about 2 inches. They were carbon dated to be about 5,600 years old.
What does the word "expands" mean in the sentence above?
A ?
evaporates
B. ? reacts
C. ? get larger
D. ? get smaller
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