08 - Exam 2 stats Your grade so far. Quizzes 1-7 (15 each =...

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1 Exam 2 stats B A C D F Your grade so far… • Quizzes 1-7 (15 each = 105 ) • Exams 1-2 (150 + 200 = 350 ) • HW 1-2 (25 each = 50 ) • Quizzes 8-12 (15 each = 75 ) • Exam 3 ( 250 ) • HW 3-4 (25 each = 50 ) • Project ( 150 ) 505 375 505 + 375 + 150 = 1030 … Grade is out of 1000 Still to come… Over the last 10 weeks… • Physical structure / evolution of ocean basins • Oceanic resources • Ocean / seawater chemistry • Physical motion of seawater • Relationship between ocean and climate • Changes in ocean over time … in the next 6 weeks • Coastal processes • Marine organisms / ecosystems • Human influence on ocean ecosystems • Case studies of ocean science • Extraterrestrial seas? Coral reef Sea urchins
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2 Coastal Processes …the dynamic natural processes in coastal environments (including Great Lakes!) and natural responses to human intervention. Flat sandy beach Rugged rocky coast Natural time scales of coastal change? • Is coastal land “stable”? • Because we treat the coast just like all other land -- as a stable platform on which we can safely and easily build -- some of our actions directly conflict with the dynamic nature of coasts. • changes along coasts happen on time scales much shorter than other geologic processes • ex: natural rates of beach erosion and replenishment vs seafloor spreading Cape Hatteras in North Carolina the coast itself moves as it tries to achieve equilibrium with the forces acting on it… For example: • Barrier islands and offshore sand bars move landward and along the coast, driven by longshore currents. Headlands are eroded back, moving the coast inland. • Sediment is deposited on river deltas, extending the coast out into the water. Coastlines also move in response to changes in sea level; even if the land remains stationary, a rise in sea level will move the coastline inland… Natural process… …or problem?
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3 Shore = right where the ocean meets land Coast = whole ZONE affected by processes that occur at this boundary • Earth has 440,000 km (273,000 miles) of shore • Coasts subject to processes from both ocean & land – ex: waves tides, rivers, ocean storms, tectonic activity, volume of water in ocean (ice), uplift, subsidence, erosion, sediment transport, sediment deposition, wind, organisms, glaciers, etc… This former seafloor at Prince William Sound, Alaska, was raised 3.5 m (12 ft) above sea level by tectonic uplift during an earthquake in 1964. The exposed surface, which slopes gently from the base of the sea cliffs to the water, is about 400 meters (14 mile) wide. The light-colored coating on the rocks consists mainly
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This note was uploaded on 04/29/2008 for the course EAS 104 taught by Professor Brown during the Spring '08 term at Purdue University-West Lafayette.

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08 - Exam 2 stats Your grade so far. Quizzes 1-7 (15 each =...

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