The only technology that can 'see' beneath the ground is radar imagery. But satellite imagery also allows scientists to map short- and long-term changes to the Earth's surface. Buried archaeological remains affect the overlying vegetation, soils and even water in different ways, depending on the landscapes you're examining.

Although men are accused of not knowing their own weakness, yet perhaps few know their own strength. It is in men as in soils, where sometimes there is a vein of gold which the owner knows not of.

A nation that destroys its soils destroys itself. Forests are the lungs of our land, purifying the air and giving fresh strength to our people.

Once you digitize data, you can actually analyze patterns and relationships in geographic space - relationships between certain health patterns and air or water pollution, between plants and climate, soils, landscape.

Man seems to be the only animal whose food soils him, making necessary much washing and shield-like bibs and napkins. Moles living in the earth and eating slimy worms are yet as clean as seals or fishes, whose lives are one perpetual wash.

Although men are accused of not knowing their own weakness yet perhaps few know their own strength. It is in men as in soils where sometimes there is a vein of gold which the owner knows not of.

A nation that destroys its soils destroys itself. Forests are the lungs of our land purifying the air and giving fresh strength to our people.