| A | B |
|---|
| current | river of water flowing through the ocean |
| basin | ocean floor containing mountains,valleys, and plains |
| abyssal plain | flat bottom of the ocean-layers of sediment cover over hills and valleys |
| continental shelf | underwater edge of the continent |
| continental rise | buildup of sediment on the ocean floor at the bottom of the continental slope |
| seamount | volcano causing huge underwater mountain-may emerge as an island |
| trench | narrow V-shaped valley-some are the deepest point on Earth |
| mid-ocean ridges | chain of mountains that wind through the major oceans of the world |
| continental slope | leads from the continental shlf to the sea floor |
| density | measure of how tightly packed the matter of an object is |
| tides | bulges of water resulting from the gravitational pull of the moon |
| waves | motion of water |
| crest | top of a wave |
| trough | bottom of a wave |
| minerals | elements leached from rocks from Earths' surface that are found in ocean water and on the ocean floor |
| SONAR | location system using sound waves |
| Sunlit zone | upper most layer of the ocean-80% of the plants and animals in the ocean live here |
| Twilight zone | just below the sunlit zoen-dark and more pressure |
| Dark zone | very dark,deep, cold, with lots of pressure |
| The Abyss | bottom most layer of the ocean- very little life forms found here |
| neap tide | smallest tide |
| spring tide | highest or lowest tide |
