Streams

No. Although sturgeon and catfish can be found in the same habitats and they both have barbels (whiskerlike growths extending from the jaw), they are not closely related.
Asian carp of all types have white, firm, mild flesh, which is excellent table fare, but all Asian carp also have intramuscular bones in the filets that many people find undesirable.
Many studies show that bighead and silver carp substantially change ecosystems where they have been introduced.
You can view a national map of hardness in surface and ground waters at this Water Hardness website.
Yes, it is not unusual for salt marshes to experience dieback in small patches in some years. However, these areas are usually less than an acre or so in size and generally regenerate the next year or over the next several years.
An exponential increase in the population numbers of bighead and silver carp began in the mid-90s and continued through the mid-2000s in parts of the
Both bighead and silver carp become fairly large; records of both species approach 100 pounds, but silver carp over 20 pounds and bighead carp over 30 pounds are uncommon. The North American record for bighead carp is a 106-pound fish from Missouri.
Floods are a dangerous hazard throughout the world. On average in the United States, about 165 people are killed and about $2 billion of damage occurs each year. Most people underestimate the power and destructiveness of flood waters.
The salinity of Great Salt Lake is measured by taking specific gravity and temperature measurements and comparing them to standardized values reported in a table.
A basic introduction to natural filtering of water can be found on-line at the USGS 'Water Science for Schools' website.