Explain how incinerator ash can become toxic when the initial material that is incinerated is not toxic.
What will be an ideal response?
Batteries contain heavy metals (cadmium, lead), which are released into the atmosphere upon burning. Most plastics contain chlorine, which forms dioxins upon combustion.
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The nebular theory proposes the sun and planets formed from a rotating cloud of interstellar gases and dust called a ________.
A) solar nebula B) planetesimal C) protoplanet D) celestial sphere
How does "brain drain" impact the underdeveloped countries?
A) Talented people (doctors, engineers, scientists) move to the developed world. B) Inadequate nutrition during childhood prevents the young from being healthy. C) Schools are often unfunded, which means talents are not fully developed. D) Investments in infrastructure are often poorly made and do not complement one another (an area might have running water but no electricity). E) None of the above are impacts of "brain drain."
Which of the following is NOT typical of a lake ecosystem?
A. a euphotic zone B. corals C. plankton D. many kinds of aquatic insects
The force of a falling watermelon hitting the ground depends upon
A. the time of contact with the ground. B. the speed of the watermelon just before it hits the ground. C. whether or not the watermelon bounces. D. all of the above