DUA 3, Standards 1&2, Day 2

Why are estuaries often valued as the center of human coastal communities?

• estuaries create mild habitats for deep sea life

• estuaries enhance marine biology resources for the future

• estuaries are needed to filter pollution out of ocean water

• estuaries provide a place for people to live, fish, and swim

Which causes cold ocean water to rise during an upwelling event?

• motion of organisms

• deep water currents

• mass of nutrients

• surface winds

Which best describes the types of organisms found in estuaries?

• They can only survive in salt water

• They are only found in freshwater

• They cannot tolerate brackish water

• They tolerate both freshwater and salt water

Which would most likely be discovered by researchers exploring the ocean with remotely operated vehicles (ROVs)?

• new terrestrial species

• new phytoplankton species

• new photosynthetic species

• new chemosynthetic species

What are the two main sources of the dissolved oxygen in the ocean?

• surface air mixing and ocean plants

• warm water vents and the Earth's core

• underwater volcanoes and earthquakes

• animal respiration and dead matter decomposition

Which will most likely result if there is increased upwelling in a coastal area?

• more aquatic life

• fewer nutrients in the water

• higher ocean temperatures

• fewer nitrates

Which best explains why estuaries are such productive ecosystems?

• They have high saltwater content

• They have high levels of dissolved gases

• They receive nutrients from both rivers and the ocean

• They receive chemicals from commercial and industrial runoff

Which best explains the effects of a hurricane on estuary circulation and salinity?

• Salinity levels remain the same as before the hurricane.

• Salinity concentrations stay stable for a week after a hurricane.

• Surface salinity drops within a few hours of a hurricane passing.

• Salinity quickly increases during a hurricane and then sharply decreases.

Organisms that live in an intertidal zone must be able to tolerate which changes to survive?

• changes in temperature but not salinity

• changes in salinity but not temperature

• changes in both temperature and salinity

• changes in neither salinity nor temperature

In which location would fisherman most likely catch a great number of fish?

• at the shoreline

• in an upwelling event

• in the intertidal zone

• on the deep ocean floor