the water doesn't flow down stream
Yess.
Damming a river will affect the estuary at the river's mouth by lowering the amount of water passing through the estuary. This can cause the loss of habitat and nursery areas for small fish, birds, and even sharks.
its called an Estuary... An estuary is a semi-enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea.[1] Estuaries are often associated with high rates of biological productivity.
Since we have no idea what "this" might be, we can't answer the question properly.
No one invented rivers someone might have discovered them
Many words have no apparent antonym. If an estuary is the mouth of a river, 'source' might be one, by some definition.
Kino tied branches to the tail of his canoe, making it appear as though he had traveled upriver instead of downstream. This was done in an attempt to confuse anyone who might be tracking their movements.
you can't walk on water
I might Be wrong But I assume Full Rivers would be 17 x
Questioning 'what is the average salinity in an estuary?' is the wrong question! An estuary is formed where a river meets the sea, the sea would be typically around 35,000 mg/L (total dissolved salts) and the river may be very fresh, say 100 mg/L or possibly brackish if it has picked up salt along the way. That may depend on the river flow rate and salt accessions within the river basin. The salinity of the estuary will range from sea salinity to fresh along the length of the estuary depending upon tidal interchange and river flow rates. A more important question, particularly for the ecology, is what is the transient range at any point and how might this vary depending upon seasons and drought cycles. This will affect the range of ecologic systems (flora and fauna) that can thrive or survive. Some systems need only fresh water others need only salt water, however the estuary offers the opportunity for fish and other species which enjoy different salinity at different parts of their life cycle.
By trying out policies that might later affect the entire nation
milk contains calcium and that is what which might affect plant growth