This ECO-Tour of the mind requires us to imagine the Earth as an apple.
Tuesday, March 14, 2017
Get an Apple...
I saw a great visual aid for understanding just how important the topsoil of our planet is. Let me thank the filmmaker of One Man, One Cow, One Planet, for showing this very exercise to help understand the Earth and her biosphere. In this example, or mind exercise if you prefer, it helps to understand that an apple when representing the Earth, has a skin about as thick as the zone within all life flourishes. The apple skin is actually true to scale as if it were to represent the thickness of a zone, it represents the distance between the top of the atmosphere, where life can live, around the height of Mt. Everest 8,848m (about 29K feet); to the deepest point in the ocean, nearly 11,000m (36Kfeet) below the sea level the Challenger Deep (part of the Marianas Trench). This becomes important later on, when the end of the example comes up. Keep in mind that within this thickness, all life we know of exists. Soil thickness within that tiny sliver of life is rarely more than a few feet deep, out of that peel of the apple nearly twelve miles thick. 20,000m (65Kfeet) in a few places soils are mere inches thick and places where chemical agriculture has predominated, the humus is nearly non-existent, leading to bankrupt soils that can only grow crops with massive chemical inputs.
Concentrate on how much of the apple goes away. These portions are unavoidable physical facts.