Texas' only natural lake is:

The scientific study of ecosystems and all of their living and non-living factors is:

The bottom of a stream is known as the:

A "hypoxic zone" is otherwise known as a:

Which of these is an ABIOTIC factor?

Which of these is an ABIOTIC factor?

Which of these is a BIOTIC factor?

We live in this aquifer:

Which of these is an aquatic ecosystem where groundwater appears above ground?

An area of transition between the stream edge and uplands that contain trees, shrubs, grasses, is known as:

Which of these natural events can greatly impact our aquatic ecosystems?

This is when groundwater replenishes itself through rains:

A large, man-made lake that supplies water for large communities, electrical power, and recreation:

A typically brackish area that can be anywhere, is typically flooded, and is home to a variety of wildlife:

A partially enclosed water body on the coast created by one or more rivers where freshwater and salt water mix:

A mix of freshwater and salt water creates: