Q: Practical limits of van de graaff generators arise because the large electric fields polarize and eventually do what to surrounding materials? Choices: - displace - isolate - decompose - ionize A:
ionize

Q: What component of an organism, made up of many cells, in turn makes up an organ? Choices: - muscles - molecules - epidermis - tissues A:
tissues

Q: Q: Lots of volcanoes form along which boundaries? Choices: - deposit plate bounderies - basalt plate boundaries - geyser plate boundaries - subduction plate boundaries A:
A: subduction plate boundaries

Question: Q: What process is at work when warm air or water rises, and cool air or water sinks? Choices: - evaporation - radiation - moisture - convection A:
Answer: convection

*Question*
Q: What type of seed-bearing structure of a flowering plant usually develop into? Choices: - Stem - food - Apple - fruit A:
**Answer**
fruit

(Q).
Q: How many valence electrons does nitrogen have? Choices: - 4 - 10 - 3 - 5 A:
(A).
5