Use the drop-down menus to complete the
corresponding cells in the table to the right.
Beta Decay
Alpha
Decay
Gamma
Decay
A
electron or
positron
BLUE
Penetrating
Shielding
D
thin metal
lead bricks
E
DONE

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

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What physical property of gold makes panning a useful way to get gold from streams?