Question

What are the key characteristics of estuaries? How can sea ice or snow cover affect climate? How do human activities affect glaciers? How do human activities affect streams and lakes?

Answer 1

Where rivers meet the sea. Home to unique plant and animal communities in brackish water.

Explanation:

Estuaries and their surrounding wetlands are bodies of water usually found where rivers meet the sea. Estuaries are home to unique plant and animal communities that have adapted to brackish water—a mixture of fresh water draining from the land and salty seawater.
https://oceanservice.noaa.gov/facts/estuary.html

Ice and snow cover affect the albedo of the earth and the amount of reflected sunlight. That affects the amount of direct solar radiation energy that can be adsorbed by the earth.