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To begin this, you'll first note down the valencies of atoms you're sure about.
K is always 1+
And O is always 2-, except for in peroxide where it is 1-.
So now you must remember that a compound is always neutral. Your net charge has to be 0.
K2Cr2O7.
K2 (1+ x 2) = 2+
Cr (2x) = 2x
O7 (2- ×7) = 14-
+2 +2x + (-14) = 0
•Simple algebra.
2x -12 = 0
2x = 12
x = +6.
Each Cr atom has an oxidation number of +6.
The correct answer is - landscapes.
Both the compression and the erosion are processes that contribute to the shape and form of the landscape. They are different from one another and create different types of landscape forms. The compression is the one that creates hills, mountain ranges, highlands, and it does that by creating a lot of pressure on the land which gradually lifts it upwards. The erosion, on the other hand, is a process that has the opposite effect. The erosion has a tendency to flatten the landscape. It moves away the sediments broken down by the weathering and gradually makes the landscape flatter. Also it creates numerous interesting shapes in the nature, especially on the places where the wind and the water are the ones responsible for the erosion.
