The first layer, or base layer, should consist of large, angular crushed stone, typically around 4 inches in diameter. This stone is often referred to as "#1" gravel and is crucial for providing a ...

The mission's principal investigator Steve Squyres said that a peak some 25 to 30km away was visible from the photo and also described the surfaces of the rocks as "remarkably smooth." Bell noted ...

In the long run this erosion can be stopped by installing the same 3-inch interlocking angular rock I used on my driveway. Much more force is needed to dislodge these.

Previously, angular debris was assumed to have been created by changes typical of cold, periglacial environments, such as fracturing due to frost. Water enters cracks in rocks and when it freezes ...