Care for the elderly requires a substantial amount of energy, resources, and manpower. Chinese elderly primarily rely on their family for health care. Describe one potential benefit and one potential problem associated with the emigration of elderly individuals from rural to urban areas.

Which statements describe continental crust? select the three correct answers. a-it is formed in all parts of the continents. b-it is made mostly of volcanic rock. c-it is destroyed by melting near the top of the mantle. d-it is less than 10 km thick. e-its ages ranges from very young to more than 4 billion years old.