<span>Immigration currently accounts for about _______ of U.S. population growth.
Answer: B one-third</span>
Answer:
Spain by "then" will be a depopulated nation dominated by elderly and single people,the country will have lost 5.3million inhabitants, or 11% of the century.If the trends continue,by then the over 65s will make up 34.6% of the population, while close quarter of a million Spaniards will be over 100yrs old.By that date there will be 1.7million fewer children under 10 than there are now.....
Answer
Continental crust is generally older than oceanic crust
Explanation
The average density of the continental crust is lower (2.6 g/cm3) than the oceanic crust(3.0 g/cm3). This allows the continental crust to float on the upper mantle. The rocks in the oceanic crust are younger than those in the continental crust. The continental crust is thicker( 35-70km) than the oceanic crust(5-10 km).
