In the glogerm laboratory, one group designed an experiment to test handwashing soaps for removal of germs that are invisible in regular light. student a washed her hands for 30 seconds with liquid soap, student b washed her hands for 30 seconds with bar soap, and student c washed her hands for 30 seconds with water. after washing, the students looked at their hands under black light for fluorescent germs. the responding variable in this experiment was:

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes