Science words that start with "Y" and "z"?

Question

Ok, in science class we have a dumb science project where you have to look up terms from all of the chapters we have studied and write about them and the terms have to be from A-Z. I am in 6th Grade. We have studied minerals (nothing big like zyyithum) Stuff like fracture, mineral, inorganic, luster, streak, etc... Those kind. And we have studied regular science stuff in the beginning of the year like observing, data, scientific law, scientific theory, etc.... And we studied Plate tectonics, The atmospere like terms like ozone, water vapor, etc... And we studied weather factors like terms like electromagnetic radiation, etc... weather patterns, earth moon and sun terms for that are like axis, revolution, solstice, etc... and the Starts galaxies and the universe with terms like convex lens, radio telescope, spectrum, and visible light. So I can not find any terms that start with the letter Y and Z. Can you tell me some terms for 6th grade science? THANKS!! BTW its due 5-28-2008.

Answer 1

In the metric system you have:

zepto or 10 ^-21 like 1 zeptosecond (very fast)

yocto or 10 ^-24 like 1 yoctosecond (very very short)

Answer 2

As mentioned, zinc is a good one for "z".  How about "yellow" for "y" from the visible light spectrum?

Answer 3

Yttrium- Element on Periodic Table

Zinc- Element on Periodic Table