- Upper Dry Gulch Natural Area Preserve (dnr.wa.gov)
This 3,087-acre preserve protects the largest known population of Whited’s milkvetch, a state-listed “endangered” plant species that is found only within a 3-square-mile area. Situated in the arid mountains southeast of Wenatchee, this site is dominated by a native shrub and bunchgrass (shrub-steppe) ecosystem that is recovering from past land uses. The drainage that flows through the site carries water seasonally and is subject to torrential flows during spring. The loggerhead shrike, a bird species known to be highly dependent on shrub-steppe habitat, is also known to frequent this area.
- Chemical bond (Wikipedia)
A chemical bond is the association of atoms or ions to form molecules, crystals, and other structures. The bond may result from the electrostatic force between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds, or some combination of these effects. Chemical bonds are described as having different strengths: there are “strong bonds” or “primary bonds” such as covalent, ionic and metallic bonds, and “weak bonds” or “secondary bonds” such as dipole–dipole interactions, the London dispersion force, and hydrogen bonding.