Presentation on theme: "The Ocean Floor Anything which looks like this is a link to the next page! Next."— Presentation transcript:
The Ocean Floor Anything which looks like this is a link to the next page! Next
2 What do you think of when you imagine the ocean floor? Talk this over with your partner for a minute. Next
You probably think of something like this… Next
…and maybe you imagine underwater life like this… Next
…but did you ever think the ocean looks like this? It does! Next
As the ocean gets deeper, it also gets darker. Sunlight only penetrates about 500 ft. down to 20,000 ft ft Next
As the ocean becomes deeper and darker, it also becomes… Colder Hotter
Yes! The ocean varies greatly in temperature, all the way from the tropical waters (100 degrees F) near the equator to the freezing waters (0 degrees F) of the North and South poles. Warmer waters Colder waters
Life in tropical waters is very similar to life in the rainforest. There is a lot of variety; which means there are many different kinds of species. The temperature of the water is close to that of your bath tub at home. This is the Great Barrier Reef, off of the coast of Australia. As you can see, there is a lot of life here! Coral reefs support about 25% of all marine (underwater) life in the ocean. This is a kelp forest. They are common in temperate (moderate, or medium) temperatures off the coast of California and parts of South America. They are very productive ecosystems! Back
11 Life in the cold waters of the Arctic and Antarctic is very different from the life in the tropics. Because the water is so cold, many animals have adapted, and developed their own ways keeping warm. Plants are very scarce! A certain type of fish, called nototheniods, have developed a natural antifreeze in their blood. This helps them withstand very cold temperatures. Mammals in cold water, such as this Beluga whale, have many layers of blubber, or fat, to keep themselves warm. Next
12 Now that we have some background information, we can begin with the parts of the ocean floor. Continental Edge Next
Continental Shelf This is the part of the continental crust which is underwater. It can vary from almost nothing to 930 miles wide! Remember when we looked at Google Earth? The continental shelf was the light blue part off the coast, and it is the same in this picture. The shelf has the most sunlight out of any layer of the ocean, because it is only ft deep. This means many animals and plants thrive (do very well) here. Do you think the continental shelf has... 90% of all marine life oronly 35% of all marine life?
14 The continental shelf is very shallow, which means sunlight can get into the water. This allows photosynthesis, a process which plants use to get food. This means many animals also thrive. Oops! Try again!
15 That’s right! The shelf has the most sunlight out of any layer of the ocean, because it is only ft deep. This means many animals and plants thrive here; 90% of all marine life to be exact! Included are the coral reefs and kelp forests we talked about earlier. When you swim in the beach, you are in the continental shelf. Next
16 Continental Edge Next is the continental edge. This is an easy one! It is the point at which the continental shelf turns into the continental slope! The ocean floor starts to become much steeper. In this picture, look at the black line (it is an ongoing point). Next
17 The continental slope is a very steep drop beginning at the continental edge. It extends to over two miles deep. The water becomes much colder and the pressure increases greatly. Next
18 Continental Rise This is the last part of the gradual slope before the ocean floor. Much like the continental shelf, edge, and slope, it is covered in mud, sand, and rocks. They layers of the continental rise are very thick because sediments are deposited here. Next
19 Click on the arrows next to the landforms to learn more about them. After you have finished all 4, click next. Next
20 Abyssal Plain The abyssal plain begins at the bottom of the continental rise. It is mostly flat and there is no light and very little oxygen. This means that there are very few plants and animals. The ground is covered with sand and mud, and the remains of plants and animals that have sunk to the bottom. Check out creatures of the deep!
21 This eel, called the umbrellamouth gulper, puffs out it’s mouth to catch whatever life it can find. This fish has a barb which comes out of it’s chin, as well as two rows of glow-in-the-dark spots running along it’s sides. This creature, known as the vampire squid, has giant eyes compared to the size of it’s body, which is only about 6 inches long. Next
22 Called the longnose chimaera, this shark- like animal can reach up to 5 ft long! It has an extremely poisonous spine on its back. It can kill a person! This fish, although only 3 inches long, has its own fish hook and light attached to its back! These are called “Prince Axel’s wonderfish,” and how they are indeed! They have their own organ which dangles from their mouth to create light. It helps attract other smaller creatures. Back to the arrows
Guyots 23 Back to the arrows This is a computer- generated image of a guyot. They are seamounts (islands formed by volcanoes) that have been flattened by waves.
Seamounts 24 Back to the arrows A seamount is an underwater mountain that forms from erupting volcanoes. If a seamount rises above the surface of the water, it is an island. The Hawaiian Islands were formed this way.
Ocean Trenches 25 Back to the arrows A trench in the ocean is very similar to a canyon (like the Grand Canyon) on land. It is formed by rivers and currents cutting through the ocean floor. Trenches are extremely deep and dark. The deepest trench on Earth is almost 7 times as big as the Grand Canyon!