Answer:
the answer is b
Explanation:
convection is caused by density differences whereby warm air with less density rise above a heater and sink near a cold wind.
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I think 1.56
physical change because even though gas formation was observed the water was undergoing a state change which means that it's original properties are preserved
Answer: It is called a Crookes Tube, and he used it to discover cathode rays, which were later determined to be electrons.
