Historically, people lived in crowded cities because they had to be within walking distance of shops and places of employment
Indicate whether the statement is true or false.
Answer: TRUE
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When blue food coloring is stirred into water, the result is a
A. pure liquid. B. homogeneous mixture called a solution. C. homogeneous mixture called a suspension. D. heterogeneous mixture called a suspension. E. heterogeneous mixture called a solution.
Researchers have drilled all the way to the mantle
a. True b. False
What is the source of energy inside the Sun?
A. Nuclear fusion B. Radioactive decay C. Nuclear fission D. None of these choices are correct
The part of the atmosphere that contains weather and supports life ________
A) extends about as high above the Earth as the distance from Earth's surface to its center B) is much shorter than the distance from Earth's surface to its center C) is the hottest part of the atmosphere D) consists largely of oxygen E) consists of a chemical compound called "air"