Presentation on theme: "Geological Landforms of the ocean floor"— Presentation transcript:
1Geological Landforms of the ocean floor VocabularyContinental shelfContinental slopeMid-ocean ridgeRift zoneTrenchesOcean basinMain Idea: Geological landforms of the ocean floor can be identified using diagrams and illustrations.Lesson 2
2The edges of the continents slope down from the shore into the ocean Continental shelfThe edges of the continents slope down from the shore into the oceanThe part of the continent located under the water is called the continental shelfThe width of the continental shelf varies around the edges of the continentsIn some places the continental shelf is fairly shallow and in other places it becomes very deep – but it is not the deepest part of the ocean
3Continental ShelfThe edge of the continent that is under water is known as the continental shelf.
4The depth of the ocean water increases greatly here. Continental SlopeThe steep slope where the continental shelf drops to the bottom of the ocean floor is called the continental slope.The depth of the ocean water increases greatly here.
5Continental slopeThe steep slope where the continental shelf drops to the bottom of the ocean floor.
6Mid-ocean ridge On the bottom of the ocean, there is a central ridge (or mountain range) that dividesthe ocean floor into two parts.These underwater volcanic mountains are known as the mid-ocean ridge.Volcanic mountains not formed on the mid- ocean ridge are called seamounts.
7Mid-ocean ridgeThe mid-ocean ridge divides the ocean floor into two parts. These underwater volcanic mountains are known as mid-ocean ridges.
8Rift ZoneIn the center of the highest part of the mid- ocean ridge is a narrow trench called a rift.Underwater volcanic activity that adds mountains to either side of the mid-ocean ridge occurs at the rift zone.
9Rift zoneIn the center of the highest part of the mid-ocean ridge is a narrow trench called a rift. Underwater volcanic activity that adds mountains to either side of the mid- ocean ridge occurs at the rift zone.
10TrenchesThere are so many steep-sided canyons and deep, narrow valleys in the bottom of the ocean.Ocean trenches are the deepest part of the ocean basin and are deeper than any valley found on land.
11TrenchesA trench is a steep-sided canyon with deep, narrow valleys in the bottom of the ocean.
12Ocean basinThe ocean basin is located on either side of the mid-ocean ridge.It is made up of low hills and flat plains.The flat area of the ocean basin is called the abyssal plain.Seamounts are generally formed on the ocean basin.
13Ocean basinThis area is made up of low hills and flat plains.
14Low land between hills or mountains ComparisonContinental – ValleyOceanic - Rift
15Deep valley with high steep sides ComparisonContinental – CanyonOceanic - Trench
16An opening in the surface from which lava flows ComparisonContinental – VolcanoOceanic – Seamount and Volcanic islands
17Land which rises high above the ground ComparisonContinental – Mountain RangeOceanic – Mid-ocean ridge
18Oceanic – Abyssal plains Wide, flat areas of landComparisonContinental – PlainsOceanic – Abyssal plains
19Continental & Oceanic landforms DescriptionContinentalOceanicLow land between hills or mountainsValleyRiftDeep valley with high steep sidesCanyonTrenchAn opening in the surface from which lava flowsVolcanoSeamount & Volcanic islandsLand which rises high above the groundMountain rangeMid-ocean ridgeWide, flat areas of landPlainsAbyssal plains