A mixture of unconsolidated, weathered earth materials and humus is 

A structural unit that is repeated in three dimensions is called a 

The brightest object in the sky after the Sun and Moon is most often 

Mountains that rise sharply from surrounding land along a steeply inclined fault plane are 

The S-wave is a 

Our Sun is just one of many millions of stars in a group of stars called a 

The layer that is broken up into plates that move in the upper mantle is called the 

The primary difference between fog and a cloud is 

The least dense rocks in Earth are found in 

The planet listed below with the greatest density is