At the fireworks show, Michael is afraid and thinks his newb…

At the fireworks show, Michael is afraid and thinks his newborn sister is sick when she suddenly flings her arms and legs out from her body, then pulls them in tightly.  Michael’s mom is not concerned because she knows this is just the baby’s _______ reflex.

Beth’s parents are athletic, and they tend to take Beth to a…

Beth’s parents are athletic, and they tend to take Beth to all types of athletic events and activities like mountain biking, roller blading, and skiing.  As a result, she has many opportunities to practice her athletic skills.  That her parents expose her to so many athletic activities is an example of the

Sally steps on her bathroom scale, and it tells her that she…

Sally steps on her bathroom scale, and it tells her that she weighs 145 pounds. When she steps on it again after her shower, she gets the same result. In fact, it has told her that her weight is stable at 145 pounds for several days now. This is very distressing to Sally, because she actually only weighs around 127 pounds. Which of the following could be said about Sally’s scale?

Below are two scenarios describing real dating methods that…

Below are two scenarios describing real dating methods that we didn’t discuss in class. Apply your knowledge from lecture and your readings to identify each scenario as either absolute or relative dating. Scenario #1: The earth’s magnetic polarity hasn’t always been North; prior to about 780 kya the magnetic pole was South (your compass would have pointed South instead of North). You observe that a recent fossil find is located above a layer with reversed polarity and therefore conclude that it must be younger than 780 kya. What type of dating is described in this example? [relative]   Scenario #2: When 238Uranium decays it releases fragments that actually scratch the internal surface of some types of rocks. Knowing the half-life of 238U, you count the scratches in the rock to estimate how much 238U was left in the rock and estimate the age of your strata as 200 kya.  What type of dating is described in this example? [absolute]