Presentation on theme: "Ch. 19 The Ocean Basins Sect. 19.1. Oceanography The study of the physical characteristics, chemical composition and life forms of the ocean Matthew F."— Presentation transcript:
Oceanography The study of the physical characteristics, chemical composition and life forms of the ocean Matthew F. Maury - began early study in 1850’s using records from navy ships
Why Study Oceanography To Feed Us - Aquaculture To predict weather Mineral Resources
Global Ocean Covers 3/4 of the earth’s surface (this is the most prominent feature on Earth!) contains 97% of all the water on the earth Totals 1/800 of Earth’s total volume 5 oceans: Pacific, Atlantic, Indian, Arctic and Southern (Antarctic) smaller areas of the oceans are called seas
SONAR Sound Navigation and Ranging consists of a transmitter and receiver sound waves are used to map and make profiles of the ocean floor
* * Transmitter sends out sound waves @ 1500 m/s * * Sound waves are reflected back to receiver * * The time elapsed gives depth or distance: Speed = Distance Time Distance = Speed x time Time = Distance Speed
…it would take 125 years to totally map the ocean floor using sonar…
…these days we can use satellite altimetry! The bumps & dips on the ocean’s surface mimic the topography of the ocean floor. SEASAT (and later GEOSAT) circle the earth; their sensitive radar altimeters send data used to create ocean floor maps.