Minerals are links between Earth and human health. The earth's crust contains most of the mineral nutrients our body needs, and the chemical composition of a rock, such as granite, is strikingly similar to the composition of the human body. We rely on geologic processes such as weathering to chemically break down rocks into other natural materials, such as soil, that contain minerals more easily dissolved and are absorbed by roots of plants. When we inhale, the oxygen in the air is bonded to the iron contained in haemoglobin.
Landscape, Poetry and Place