Earth's Oceans Test

Abyssal Plains are _______ on the ocean floor.

• Very Deep canyons
• Flat, sediment -covered areas
• Continuous volcanic mountain ranges.

_____ are the deepest parts of the ocean.

• Trenches
• Mid-Ocean riges
• Continental margins

Only organisms in the ________can make food.

• surface zone
• top of the deep zone
• bottom of the middle zone

How did ocean water become salty?

• It mixed with methane hydrates.
• Rain dissolved minerals from rocks.
• Volcanoes erupted water vapor into the air.

Earth's oceans formed when rain filled deep basins on Earth.

• True
• False

Manganese nodules are mineral resources from the ocean floor.

• True
• False

Evaporation in polar regions causes surface water to become saltier.

• True
• False

Asteroids and comets might also have added water to the oceans.

• True
• False

On average, the salinity of seawater is 55 parts per thousand.

• True
• False

____________ are large, flat areas of the seafloor that are covered in sediment.

• Abyssal Plains
• Trenches
• Mid-Ocean Ridges