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Ocean flashcards

ch.11 ocean flashcards- vocab project

What is sonar? a device that determines the distance of an object under water by recording echoes of sound waves.
What is a continental shelf? a gently, sloping area of the ocean floor that extends outward from the edge of a continent.
What is a continental slope? a steep incline of the ocean floor leading down fom the edge of a continental shelf.
What is an abyssal plain? a smooth, nearly flat region of the ocean floor.
What is a mid-ocean ridge? an undersea mountain chain where new ocean floor is produced.
What is a trench? a deep, steep-sided canyon in the ocean floor.
What is the intertidal zone? an area that streches from the highest high-tide line on land out to the point on the continental shelf exposed by the lowest low-tide line.
What is the neritic zone? the area of the ocean that extends from the low tide line out to the edge of the continental shelf.
What is the open-ocean zone? The deepest, darkest area of the ocean beyond the edge of the continental shelf.
What is a wave? the movement of energy through a body of water.
What is a wavelength? the horizontal distance between the crest of one wave and the crest of the next wave.
What is frequency? the number of waves that pass a specific point in a given amount of time.
What is wave height? the vertical distance of the crest of a wave to the trough.
What is a tsunami? a giant wave usually caused by an earthquake beneath the ocean floor.
What is longshore drift? the movement of water and sediment down a beach caused by waves coming in to shore at an angle.
What is rip current? a rush of water that flows rapidly back to sea through a narrow opening in a sandbar.
What is tide? the daily rise and fall of Earth's water on its coastlines.
What is spring tide? a tide with the greatest difference between high and low tide that occurs when the sun and moon are aligned with Earth at the new moon and full moon.
What is neap tide? a tide with the least difference between high and low tide that occurs when the sun and moon pull at right angles to each other at the first and third quarters of the moon.
What is salinity? the total amount of dissolved salts in a water sample.
What is a submersible? an underwater vehicle built with strong materials to resist pressure
What is a current? a large stream of moving water that flows through the oceans.
What is the coriolis effect? the effect of Earth's rotation on the direction of winds and currents.
What is climate? the average year-after-year conditions of temperature, precipitation, winds, and clouds in an area.
What is El Nino a climate event that occurs every 2-7 years in the Pacific Ocean, during which winds shift and push warm water toward the coast of South America.
What is upwelling? the movement of cold water upward from the deep ocean that is caused by wind.
Created by: 073231