Oceanography Chapter 5

What are the most abundant types of sediments?

• Igneous and metamorphic

• Terrigenous and biogenous

• Volcanic and glacial

• Chemical and organic

What is significant about the sediments in Arizona's Grand Canyon?

• They are the oldest sediments on Earth

• They are made of marine sediment

• They are composed of volcanic ash

• They are the youngest sediments on Earth

Why are the oldest marine sediments relatively young?

• They are constantly eroded by wind

• They are subducted along with the seabed

• They are formed from recent volcanic activity

• They are exposed to high temperatures

What are ocean sediments primarily composed of?

• Only organic matter

• Only inorganic matter

• A mix of organic and inorganic matter

• Only chemical compounds

What is the approximate thickness of the sediment layer shown in Figure 5.2?

• 10 meters

• 35 meters

• 50 meters

• 100 meters

What is the depth of the sediment profile shown in Figure 5.4?

• 0.5 kilometers

• 1.0 kilometers

• 1.8 kilometers

• 2.5 kilometers

Which type of rock is most commonly associated with terrigenous sediments?

• Metamorphic rocks

• Sedimentary rocks

• Igneous rocks

• Organic rocks

What is the primary source of terrigenous sediments?

• Space dust

• Volcanic eruptions

• Marine organisms

• Precipitation of minerals

What is the main source of terrigenous sediments?

• Rivers

• Volcanoes

• Glaciers

• Wind

How much terrigenous sediment is transported to the sea each year?

• 10 million metric tons

• 15 billion metric tons

• 16.5 billion metric tons

• 20 billion metric tons