50.0 grams of radium-233 has a half-life of 30.0 seconds. How many grams of radium-233 would remain after 3.00 minutes? (Answer with numbers only. 3 significant figures. No units.

Astream of surface water reaches a porous portion of sediment and seeps into the ground. this water eventually joins a large reservoir of water located beneath the earth's surface. the example above describes the interacting with the a. cryosphere; biosphere b. hydrosphere; biosphere c. hydrosphere; geosphere d. cryosphere; geosphere