Science--Chapter 3C Exploring the Oceans

In science we are currently studying Exploring the Oceans

Chapter 3C

1. How do people map the ocean floor?

  • New sounding technology and the use of satellites provide detailed maps of the ocean floor.
  • The ocean floor has continental shelves, continental slopes, ocean basins, trenches, and ridges.

2. How can scientists explore the ocean depths?

  • Many scientists have explored and are still exploring the ocean.
  • New technology, such as a nuclear submarine, has allowed scientists to explore more of the ocean and live for long periods on the sea floor.
  • Several ocean exploration projects are in operation, and some bring students into ocean exploration.

3. How does ocean water move?

  • Ocean currents may affect the kid of weather coastal areas have, and at times a current, such as El Nino, has worldwide effects on weather.
  • The pull of the moon on ocean water causes tides.
  • Waves may cause erosion of the shoreline of the earth.

4. Where do organisms live in the ocean?

  • Tide pools, the light zone, and the dark zone are three saltwater habitats that are sometimes harmed by human activities.
  • Coral reefs protect the shoreline, provide safe harbors for ships, and provide seafood; therefore, people need to be aware of how their activities can affect a coral reef.

Chapter 3C Vocabulary

continental shelf       the shallow part of the ocean at the edge of the continents

continental slope      the edge of the continental shelf that extends steeply downward to the ocean floor

ocean basin      the floor of the deep ocean

trench               a deep narrow valley in the ocean floor

ridge                          the highest part of a chain of underwater mountains

current             a riverlike flow of water in the ocean

tide                  the rise and fall of the surface level of the ocean

wave                the up-and-down movement of ocean water caused by the wind

light zone         the sunlit waters of the ocean

dark zone         the ocean water where sunlight does not reach

coral reef         a platform or ridge of coral at or near the ocean surface