Which item can only be observed using some kind of instrument? 1.heat from the Sun 2.the planet Venus 3.a radio signal 4.an earthquake

asked Apr 18, 2023 186k views

2 votes

Which item can only be observed using some kind of instrument?

1.heat from the Sun
2.the planet Venus
3.a radio signal
4.an earthquake

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6 votes

I believe it’s 2. The planet Venus

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