PPT-Notes – Chapter 12 Ocean Waters and the Ocean Floor

The Vast World Ocean Area of Continents and Oceans Seventy one percent 71 of the globe is covered with oceans or seas Continents and islands compose the remaining twenty nine percent 29 . Ocean Zones. Which Zone?. 1. Each . group. . will be given a set of words that relate to the different zones of the ocean.. 2. At your table you will . try and place . your words in the correct zone.. What You Will Learn. Describe Wegener’s hypothesis of continental drift. . Explain . how sea-floor spreading provides a way for continents to move. . Describe . how new oceanic lithosphere forms at mid-ocean ridges. . Floor . --subsurface topography--. Ch. 13, section 2. (before the 1900’s scientists thought the ocean floor was completely flat). Sonar. (sound navigation and ranging). --invented during WWI--. to find depth: use the formula: . Chapter 14 . pg. 393. A. The Vast World Ocean. The blue planet. 71% of earth is covered by ocean. Oceanography – study of the ocean. Geography of oceans. 4 main ocean basins. Pacific Ocean. Largest ocean. Features of the Ocean Floor. Continental Shelf. Zone . of shallow water where the ocean covers the end of the continent. . Shallow slope. Where most ocean life is found. Why?. Answer: Photic zone is the first 100 feet of water and allows sunlight to penetrate the water. . 20.3. Seafloor sediments. Ocean . floor is mantled with sediment. Sources. Turbidity . currents. Sediment . that slowly settles to the . bottom from . above. Thickness . varies. Thickest . in trenches – accumulations . http://www.youtube.com/watch?v=3GRA7ilM708. Difficulty in exploring the ocean. Sunlight does not penetrate far below the surface. . Water is very cold. . Tremendous pressure. . Technology Used To Study Ocean Bathymetry. Describe Wegener’s hypothesis of continental drift. . Explain . how sea-floor spreading provides a way for continents to move. . Describe . how new oceanic lithosphere forms at mid-ocean ridges. . Explain . SO. und. . N. avigation . A. nd . R. anging. A ship sends sound waves to the ocean floor.. The sound waves bounce off the floor and back to the ship.. The deeper the water, the longer it takes for the sound waves to return.. Plate tectonics review. Earth’s lithosphere is divided into large tectonic plates. They are constantly in very slow, motion.. Plate tectonics review. ____________ pushes the tectonic plates apart in sea floor spreading. This causes the motion of the plates.. For much of human history, knowledge of the ocean and its currents was not recorded for many reasons - most sailors could not write and information was passed orally.. European nations began systematic ocean explorations but kept information secret between the 15. Submersibles, satellites, and other technology allow scientists to study the structure and composition of the ocean floor.. a. system that uses transmitted and reflected sound waves to measure distances to the ocean floor; SONAR. Ocean . Floor Features. When we look across the ocean, we see miles and miles of water. However, if we were to look under all this water, we would see many geological features that look very similar to those found on land.. Section 4. Standard . S 6.1 Students know evidence from plate tectonics is derived from the fit of the continents and mid ocean ridges. . Vocabulary. Mid-ocean ridges. Sonar. Sea floor spreading. Deep ocean trench.