When a piece of aluminium foil is taken out of the oven and cools from 100C to 50C. What is the change in temperature?

50°C

Explanation:

The change in temperature is basically the difference between the initial temperature to the final temperature. So change in temperature will be:

100°C - 50°C = 50°C

Conduction

Explanation:

Conduction. When one object touches another heat moves through it (think of a saucepan on a hot stove). Aluminium foil is a great conductor of heat, which means it is a poor insulator when it is in direct contact with something hot.

it takes about 30 days for it to break down

less than one you can't create energy