On an average yearly basis the received Trans-Atlantic signals increased in strength in proportion to the degree of ____. Made on the basis of the 11 year cycle:
A
Sun spot activity
B
Aurora borealis
C
Extratropical Advection
D
Perigean tide
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Question 1 / 20ZCIF3yI6BAh43aiR22xe
Question 1 of 20ZCIF3yI6BAh43aiR22xe
On an average yearly basis the received Trans-Atlantic signals increased in strength in proportion to the degree of ____. Made on the basis of the 11 year cycle:
On an average yearly basis the received Trans-Atlantic signals increased in strength in proportion to the degree of ____. Made on the basis of the 11 year cycle: