Monday, November 26, 2007
What is sea floor spreading? Sea-floor spreading is the process by which new sea floor is formed as it moves away from spreading centers in mid-ocean ridges.
What are some of the major land forms that are created from plate movement? Trenches, Mid-Ocean Ridges, Mountains & Volcanoes.
How were the Mariana Islands formed? The Mariana Islands were formed by volcanoes.
What evidence exists today that the plates are still moving and that the islands are ancient volcanoes? Plate Tectonics! The earth beneath our feet is not dead; it is constantly moving, driven by forces deep in its core. Nor is the planet's crust all of one piece; it is composed of numerous plates, which are moving steadily in relation to one another. This movement is responsible for all manner of phenomena, including earthquakes, volcanoes, and the formation of mountains. All these ideas, and many more, are encompassed in the concept of plate tectonics, which is the name for a branch of geologic and geophysical study and for a powerful theory that unites a vast array of ideas. Plate tectonics works hand in hand with several other striking concepts and discoveries, including continental drift and the many changes in Earth's magnetic field that have taken place over its history. No wonder, then, that this idea, developed in the 1960s but based on years of research that preceded that era, is described as "the unifying theory of geology."
What is an atoll? An atoll is a coral reef that develops as a ring around a central lagoon.
Why are atolls mainly found on the Pacific? Because atoll formation requires coral reef building, atolls are limited to tropical waters. Atolls are most commonly found in the Pacific and Indian Oceans.
Wednesday, November 14, 2007
CN: Bluefin Trevally SN: Caranx Melampygus
CN: Malabar Trevally or Eiei SN: Carangoides Malabaricus
CN: Orangespine Unicornfish SN: Naso Lituratus
CN: Great White Shark SN: Carcharodon Carcharias
In Chapter 1 it was explained that the statement “There are mermaids in the ocean” is not a valid scientific hypothesis. Can the same be said of the statement “There are no mermaids in the ocean”? Why?
Yes, I believe that the same can be said of the statement “There are no mermaids in the ocean” as the statement “There are mermaids in the ocean” because neither statement is testable.
I grew up being told beautiful stories of mermaids in the ocean therefore I believe that because marine biologists could not prove that there are no mermaids in the ocean does not mean that mermaids do not exist.
On the other hand, marine biologists may state that the statement “There are mermaids in the ocean” is a testable hypothesis since they have searched for a mermaid without success. A testable hypothesis is one that at least potentially can be proved false. In this case, they can prove that there are no mermaids in the ocean because they have not found a single mermaid.
Just for the fun of it, someone in Beaufort, South Carolina, throws a message in a bottle into the sea. Some time later, someone in Perth, on the west coast of Australia, finds the bottle. Referring to Figure 3.20 and fold-out map of this book, can you trace the path the bottle probably took?
The path the bottle probably took started from the warm currents of the Gulf Stream to the cold Canary Current where the winds would then take it to the Antarctic Circumpolar Current to where it was found in Perth, on the west coast of Australia.
This is very interesting. This reminds me a lot of one of my favorite shows; “Message In A Bottle” stars Kevin Kostner.
Tuesday, November 13, 2007
The only living representatives of a very ancient group is the hagfishes and lampreys (jawless fishes). Why do you suppose these jawless fishes do not live in our waters?
A Marine Biologist from Fish & Wildlife collected a deep-water female shark containing 20 eggs from our waters for the first time and did a detailed study on it. Do you think that the Marine Biologist will conclude that this shark species, although new, belong to the family of sharks already present in our waters? Would it be possible that this new female shark mated with one of our male sharks? Please explain your answers.
Parrot fish is one of the favorite fish of the local people. What are the advantages and disadvantages should parrot fish have an equal number of males as females present in our waters?
Thursday, November 8, 2007
A deep-water shark, new to science, is collected for the first time. The specimen is studied in detail, but its stomach is empty. How could you get a rough idea of its feeding habits? The specimen is a female, and its reproductive tract is found to contain 20 eggs. Can you tell the type of development characteristics of this species?
Hagfishes and lampreys are the only living representatives of a very ancient group. Why do you suppose there are still some of these jawless fishes around?
I suppose hagfishes and lampreys (jawless fishes) are still living today because of the simplicity of their way of life. Hagfishes feed mostly on dead or dying fishes while lampreys attach to other fishes and suck their blood or feed on bottom invertebrates. Both jawless fishes do not require much effort for survival.