1. Lichens are plants that grow in exposed places such as rocks or tree bark.
2. Lichens are widely used as environmental indicators or bio-indicators. They can be used as air pollution indicators, especially of the concentration of sulfur-di-oxide in the atmosphere.
3. They need to be very good at absorbing water and nutrients to grow there.
Magnesium is dissolved in seawater at a concentration of about 1,000 parts per million and is the only metal directly extracted from seawater.
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