Answer:
3.29ft/mi
Explanation:
The gradient of a river is the slope through which a river flows. It measures the vertical drop in elevation of river to the horizontal distance.
Mathematically;
River gradient = 
Elevation = 1229ft
Horizontal distance = 373miles
River gradient = 
= 3.29ft/mi
Explanation:
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The answer is that they arrived in Mesoamerica in the 13th century
(A) and (C) are the answers
Explaination :
The Eye Wall: a hurricane's most devastating region. Located just outside of the eye is the eye wall. This is the location within a hurricane where the most damaging winds and intense rainfall is found. The image below is of a hurricane (called cyclone in the Southern Hemisphere).
<em>Gravity has the same role as it does in any solar system it keeps the planets in order</em>
