Propagation
Question 19 of 30
During the evening the
F2 -layer falls to join the F1 -layer at a height of about 100km
F1 -layer rises to join the F2 -layer at a height of about 500km
F1 and F2 layers combine at a height of about 250km
F1 and F2 layers separate further apart
1
2
3
4
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