An estuary is where salt water and fresh water meet. Estuaries are usually found at the edge of the coast, where the ocean water, or salty water, meets river, lake, any fresh water source, water.
A tributary is something completely different. It is a, usually smaller than the main river or lake, river/stream stemming off a bigger river or lake, or flowing into that river or lake.
Answer:

Explanation:
Given
through (0,1) and (1,5)
through (0,-6) and (1,-2)
Required
Determine the value of k if f(x) is translated vertically down
To get the value of k, we perform the following operations.
For (0,-6) --- Substitute 0 for x and -6 for g(x) in 






For (1,-2) --- Substitute 1 for x and -2 for g(x) in 






To further show that k = -7, we have the following:
When translated downward by 7 units, the function becomes

Recall that:
and
So, we have:

Subtract
from both sides


It all depends on how long it has been moving without that information it cannot be answered
By observing how seismic waves are absorbed and refracted, scientist have been able to work out where the properties of the earth change dramatically. our understanding of the internal structures of the earth and the size of its core is based on these observations.
basically:
size of core
structure of the earth I.e. the layers of the earth
and I think the last one is how the internal structure is changing? not sure on the last one but its still a solid guess.
Answer:
Symbols, Language, Values, Norms, and Rituals traits are the building blocks of culture.
Explanation:
Hope this helps you as much as intended.