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.
the water doesn't flow down stream
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Yess.
the water doesn't flow down stream
please
Since we have no idea what "this" might be, we can't answer the question properly.
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.
No one invented rivers someone might have discovered them
No clue sorry
Many words have no apparent antonym. If an estuary is the mouth of a river, 'source' might be one, by some definition.
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.
No it does not, but it might affect the volume of the object (it might shrink or expand).
you can't walk on water
By trying out policies that might later affect the entire nation