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There are four types of water, or ___, ecosystems: freshwater, wetland, estuary, and ocean.
Aquatic
Important ___ factors in aquatic ecosystems include temperature, sunlight, and dissolved oxygen gas.
Abiotic
___ is the amount of salt dissolved in water.
Salinity
Water in saltwater ecosystems has high ___ compared to water in freshwater ecosystems.
Salinity
Rivers are ___, deeper, and flow more ___ than streams.
Larger, slowly
Streams usually have high ___ levels because air mixes into the water as it splashes over rocks.
Oxygen
Soil that washes into a river from streams or nearby land can add ___ to the water.
Nutrients
___ plants at dams on rivers use the energy in flowing water to generate electricity.
Hydroelectric
Ponds and lakes contain freshwater that is not flowing ___.
Downhill
___ are larger and deeper than ponds.
Lakes
Surface water in ponds and lakes contains plants, algae, and microscopic organisms that use sunlight for ___.
Photosynthesis
Runoff from farms, gardens, and roads washes ___ into ponds and lakes, disrupting food webs.
Pollutants
___ are aquatic ecosystems that have a thin layer of water covering soil that is wet most of the time.
Wetlands
Wetlands are among Earth’s most ___ ecosystems.
Fertile
___ wetlands form at edges of lakes and ponds and in low areas on land. ___ wetlands form along ocean coasts.
Freshwater, Saltwater
___ are regions along coastlines where streams or rivers flow into a body of salt water.
Estuaries
