Sandbars and sand dunes are both sand piled on top of sand by the pressure of currents. Sandbars are accomplished by the action of water currents (waves). Sand dunes by air currents (wind).
The "sand dunes and deltas" are similar to that they are both "formed by weathering".
no
They have the same rocks
Erosion and weathering is what makes any canyon smaller, and it also starts canyons.
The Grand Canyon is made of limestone.
dum
no
No. They are similar types of natural features.
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From the green growth (moss, etc.) on the canyon walls that makes it look like copper ore.
yes