Via the Huffington Post: The number of children living apart from their fathers has more than doubled in the last fifty years, from 11 percent in 1960 to 27 percent in 2010.
crust - the trait of being rude and impertinent; inclined to take liberties cheekiness, insolence, impertinence, impudence, freshness, gall rudeness, discourtesy - a manner that is rude and insulting
There are two types of crust: continental and oceanic. Continental crust is the crust under which the continents are built and is 10-70 km thick, while oceanic crust is the crust under the oceans, and is only 5-7 km thick. The deepest mine shaft ever built (Western Deep in South Africa) currently reaches 3.9 km, which is tiny compared to the continental crust.