EXPLORING THE OCEAN. LEARNING ABOUT THE OCEAN: Trading route Scientific Discoveries Exploring the ocean floor Sonar- floor mapping. EXPLORING THE OCEAN. FEATURES OF THE OCEAN FLOOR: - continental shelf - continental slope - abyssal plain - mid-ocean ridge - map on page 180-181.
LEARNING ABOUT THE OCEAN:
Exploring the ocean floor
Sonar- floor mapping
FEATURES OF THE OCEAN FLOOR:
- continental shelf
- continental slope
- abyssal plain
- mid-ocean ridge
- map on page 180-181
Continental shelf: extends from the edge of the continent outward to where the bottom sharply drops off onto a steep slope.
Continental slope: the steep incline between the continental shelf and the abyssal plain.
abyssal plain: mostly flat portion of ocean floor which provides a home to a variety of unique organisms that are adapted to the extreme conditions of this habitat.
mid-ocean ridge: A chain of undersea mountains that circles the earth through every ocean.
seamount: a volcanic peak that rises at least 3280 feet (1000m) from the seafloor. Completely under water.
3. Deepest depths:
a. ocean trench: the deepest parts of the ocean.
- the deepest one is the Marianas
trench (South Pacific)
b. hydrothermal vents: an opening in the sea floor where super-heated water and other material are discharged into
the surrounding seawater.
MOVEMENTS OF THE OCEAN FLOOR:
1. Layers inside Earth:
a. outer layer – crust
b.between crust and core – Mantle
c. center - Core
2. Earth’s plates:
a. plates: solid rock that makes up Earth’s upper layer /crust
- 14 major plates
3. plates moving apart:
a. seafloor spreading: a process by which new rock is added to the ocean floor along the boundary between diverging plates.
4. plates moving together:
- involves one plate sinking under another.