A batholith is a huge intrusion of magma that is usually many miles, sometimes hundreds of miles in diameter. The Sierra Nevada batholith forms the root […]
The central bulge. The highest concentration of stars in ANY spiral galaxy, including barred spirals, is in the center. Near the outside and even in the […]
Contour lines are used to represent elevation on a contour map. Each contour line represents a different elevation, and you can’t have two different elevations at […]