Exploring Tides, Ocean Currents, and Waves

What did people originally believe about the ocean flow?

• It was shallow and warm.

• It was constantly moving.

• It was full of mountains and valleys.

• It was smooth and flat.

What instrument did scientists use in the 1920s to map the ocean floor?

• Radar

• Sonar

• Echo sounders

• Seismographs

Which is the deepest trench in the world?

• Java Trench

• Puerto Rico Trench

• Mariana Trench

• Tonga Trench

What is the continental shelf?

• A submerged extension of the continent

• An underwater mountain range

• A deep sea plain

• A steep slope linking the shelf to the ocean floor

What is found below the continental shelf in some parts like the North Sea?

• Seamounts

• Mid-ocean ridges

• Abyssal plains

• Petroleum rigs

What are the Abyssal Plains?

• Shallow areas near the coast

• Underwater mountain ranges

• Deep sea plains with hills, valleys, and volcanoes

• Steep slopes linking the shelf to the ocean floor

What are the three different kinds of movements in the ocean?

• Waves, tides, and currents

• Waves, currents, and tsunamis

• Waves, tsunamis, and tides

• Currents, tsunamis, and tides

Tags

NGSS.MS-ESS2-6

What causes waves in the ocean?

• Earthquakes

• Volcanic eruptions

• Wind brushing the surface of the sea

• Tides

What is the highest point of a wave called?

• Peak

• Crest

• Trough

• Summit

What is the average height of ocean waves?

• 1.5 to 3 meters

• 0.5 to 1 meter

• 3 to 5 meters

• 5 to 7 meters