Light Light (sun, or lamp) Light A O Image A O Image B B You walk down the beach on Cape Cod, where waves have been bouncing shells around, including pieces of moon-snail shells, as shown here. You find 10 identical shell pieces. 9 of the 10 shell pieces appear as shown in one of the pictures (either A or B), and the 10th shell piece looks like the other picture. It is very likely that the 9 shell pieces look like:
Go to the following page for an explanation and directions for Exercise #4 (https://www.e-education.psu.edu/geosc10/Exercise4). (opens in a pop-up window), read the text, watch the short video, and then come back to complete the Exercise. Most of the questions are based on what you will read and see on this page.
Once you have watched the video and read all of the content in the directions, answer the following 6 questions about which way was up when the rocks in the pictures were formed.
You will only get one chance to submit this exercise so be sure to review your answers carefully before submission. You can, however, save your answers as long as you do not submit them first. Do not forget to hit the submit button when you are finished. This exercise will NOT automatically submit since there is no time limit (except to submit it by the due date shown on the calendar). This exercise will be graded automatically.
Do not neglect to review the content and directions before attempting the questions.(https://www.e-education.psu.edu/geosc10/Exercise4)
A few words on words: If you pour some pancake batter on a hot griddle, the pancake you make is a layer, a quarter of an inch or so thick. One side of your pancake layer is on the bottom, or down, and is being browned against the hot griddle. The other side of your layer is on top, or up, and you can put chocolate chips on it. If you then take your spatula and flip the pancake layer, so the chocolate chips are against the griddle, your layer is now upside-down, because the side that had been up is now down.
Answers:
1. IMAGE A.
Explanation
Many other "up" indicators are provided by nature. A living clam positions itself in the direction that it prefers. But as the clam decomposes and its two shells separate, they often get flipped by waves or currents into the stable frowny-face configuration (hollow-side down, or rocker-side up).
Some of the snail's shell broke off in the surf after it died. We can probably see that the shell sticks up in A in our direction. However, we can be certain if we can determine that the light was shining in the arrow's direction. The shell would have appeared like B if it had been oriented hollow-side-up (A and B are the same shell).
The hollow side of the shell is displayed in B facing us, whereas in A it is facing downward. Moon-snail fragments found on beaches typically have an A appearance and sporadically B due to the tendency of waves to turn shells hollow-side-down. Observe the areas denoted as "lit" (which were in the direct light) and "lighted" (which were in the shadow), which, along with knowing where the light was, help us determine the orientation of the shell.
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