Explain the current and predicted impacts of human activity on atmospheric carbon dioxide levels and Earth's temperature. Include evidence from your explorations and scientific reasoning to support your explanation.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

double the distance = divide strength by 4