Oceanic crust is denser than continental crust. Continental crust is more buoyant. :)
The levels of greenhouse gases in the atmosphere have been increasing due to the widespread burning of fossil fuels by the growing human populations.
Slavery was more prevalent in South Carolina than in North Carolina because settlers of South Carolina came from plantations in Barbados and settlers of North Carolina usually had small farms. Another factor why slavery was common in the Carolinas was because the colonists in the Carolinas came from the Caribbean, where slavery was common.
A nonrenewable resource<span> is a </span>resource<span> of economic value that cannot be readily replaced by natural means on a level equal to its consumption. Most fossil fuels, such as oil, natural gas and coal are considered </span>nonrenewable resources<span> in that their use is not sustainable because their formation takes billions of years.</span>
