The velocity of a stream usually increases downstream. The gradient (slope) of the stream typically decreases but gravity, elimination of bed roughness and an increase in the amount of water from the entry of tributaries tends to increase the velocity.
Answer:
It is called the S-A node, or rather sinus node.
<span>The overall amount of water on our planet has remained about the same for two billion years.
True.</span>
11460 years old is the answer.
