What did the curies conclude about radioactivity based on their studies?
the amount of radioactivity is an extensive property because it varies as the amount of material varies.
the amount of radioactivity is an extensive property because it remains constant as the amount of material varies.
the amount of radioactivity is an intensive property because it varies as the amount of material varies.
the amount of radioactivity is an intensive property because it remains constant as the amount of material varies.

Curies concluded about radioactivity that:

The amount of radioactivity is an extensive property because it varies as the amount of material varies.

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?