A rock sample contains 7.5 g of Californium-249 and 52.5 g of the daughter isotope. If the half life of Californium-249 is 360 days, how old is the rock?

How do earth’s systems interact with each other?

A. describe the model of urban structure most often observed in mega-cities in developing countries. explain how this model differs from common urban structures in north america. b. describe at least two factors leading to the growth of mega-cities in developing or least-developed countries. c. identify and explain two factors that led to the formation of squatter settlements in mega-cities in developing countries.

Asports equipment manufacturer has pressed charges against its brand ambassador and baseball legend, glenn kent , on the charges of committing breach of contract. being a federal civil case, glenn has demanded a trial by jury. which amendment of the bill of rights allows glenn to make such a demand? a. amendment 5 b. amendment 6 c. amendment 7 d. amendment 8