- Anoka, Minnesota (Wikipedia)
Anoka (/əˈnoʊkə/ ə-NOH-kə) is a city in and the county seat of Anoka County, Minnesota, United States. The population was 17,921 at the 2020 census. Anoka is a northern suburb of the Twin Cities, at the confluence of the Rum and Mississippi Rivers. It is nicknamed the “Halloween Capital of the World” because in 1920 it hosted one of the first Halloween parades. It continues to celebrate the holiday each year with several parades. U.S. Highways 10 / 169 and State Highway 47 are three of Anoka’s main routes, and it had a station on the Northstar Line to Minneapolis.
- Calcium (Wikipedia)
Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth’s crust, and the third most abundant metal, after iron and aluminium. The most common calcium compound on Earth is calcium carbonate, found in limestone and the fossilised remnants of early sea life; gypsum, anhydrite, fluorite, and apatite are also sources of calcium. The name derives from Latin calx “lime”, which was obtained from heating limestone.