Objects under water appear:
1: The same size as they do on land.
2: Twice as large as they do on land.
3: Closer and larger than they do on land.
4: Smaller and farther away than they do on land. - Closer and larger than they do on land.
As you descend:
1: Colors appear to fade.
2: Reds and ...
SDI Final Exam Objects under water appear: 1: The same size as they do on land. 2: Twice as large as they do on land. 3: Closer and larger than they do on land. 4: Smaller and farther away than they do on land. - ✔✔Closer and larger than they do on land. As you descend: 1: Colors appear to fade. 2: Reds and oranges are among the first colors to disappear. 3: At 30 m/99 ft, little color remains other than blues, g rays, blacks and whites. 4: All of the above. - ✔✔All of the above. Which of the following statements is true? There may be more than one correct answer. 1: Water is 400 times denser than air. 2: Water is 800 times denser than air. 3: Sound travels about four times faster underwater. 4: Both the second and the third answer are correct. - ✔✔Both the second and the third answer are correct. Which of the following is/are true? 1: Water conducts heat away from your body ten times faster than air does. 2: Wate r conducts heat away from your body 25 times faster than air does. 3: Fresh water conducts heat away from your body faster than salt water does. 4: Salt water conducts heat away from your body faster than fresh water does. - ✔✔Water conducts heat away from your body 25 times faster than air does. When water stratifies itself into layers, according to temperature, the boundary between layers is known as a(n): 1: Halocline. 2: Ichtyocline. 3: Thermodyne. 4: Thermocline. - ✔✔Thermocline. Which of the following is/are true? 1: Tides can make the water at a particular dive site noticeably deeper or shallower than you may have experienced previously. 2: Tidal currents can be very strong, making diving difficult or even dangerous. 3: Strong ti dal currents can have an adverse effect on visibility. 4: All of the above. - ✔✔All of the above. The sun warming water near the equator, coupled with the earth's rotation, is the primary cause of permanent ocean currents. 1: True. 2: False. - ✔✔True. Which of the following is/are true? 1: If caught in a rip current, swim directly towards shore, using the most powerful kick possible. 2: If caught in a rip current, swim perpendicular to shore, until you are completely out of the rip current, then swim in t owards shore. 3: If caught in a rip current, swim parallel to shore, until you are completely out of the rip current, then swim in towards shore. 4: Don't fight the rip current; relax and let it carry you closer to shore. - ✔✔If caught in a rip current, sw im parallel to shore, until you are completely out of the rip current, then swim in towards shore. We measure waves by their height and weight. 1: True. 2: False. - ✔✔False. Explanation: We measure waves by their height and length. Which of the followin g best describes the formation of surf? 1: Waves energy, rebounding from its impact with shore, crashes into oncoming waves, causing them to break. 2: Entering shallow water forces wave energy upward, making the wave crest unstable and causing it to break.
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