Ocean Sediment Video Questions (by EarthRocks YouTube Channel)

Olivia, Scarlett, and Zoe are participating in a science project where they have to categorize different types of sediments based on their size. What are the three categories they should use to describe sediment size?

• Muds, Rocks, Gravels

• Rocks, Sands, Gravels

• Muds, Sands, Gravels

• Muds, Sands, Rocks

Evelyn, Grace, and Avery are working on a geology project where they have to classify different types of sediment grains. They come across a grain that they identify as gravel. What size would that grain have been?

• Between 1 mm and 2 mm

• Larger than 2 mm

• Between 1/16 mm and 2 mm

• Less than 1/16 mm

Where are the largest sediment grains found in the ocean?

• Neritic waters

• Oceanic waters

• Trenches

• Mid ocean ridges

What is the main source of lithogenous sediment in the ocean?

• Hydrothermal vents

• Biological decay

• Volcanic eruptions

• Weathering of rocks on land

Which type of sediment represents minerals that are produced from ions that were originally dissolved in water?

• Lithogenous

• Biogenous

• Hydrogenous

• Cosmogenous

What are the most common plankton with silica shells?

• Radiolaria and Foraminifera

• Diatoms and Coccolithophores

• Diatoms and Radiolaria

• Coccolithophores and Foraminifera

Where do siliceous oozes dominate in the ocean?

• Mid-ocean ridges

• Polar regions

• Trenches

• Abyssal plains

What is the depth at which the acidity of the seawater is high enough to dissolve calcareous shells?

• 5000 meters

• 2000 meters

• 3000 meters

• 4000 meters

What is the main contributor to biogenous sediment in the oceanic zones?

• Shells of dead organisms

• Gravels

• Volcanic eruptions

• particles that have precipitated from the water

Where do clays dominate in the ocean?

• Abyssal plains

• Mid-ocean ridges

• Polar regions

• Trenches