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2. Empire Mine State Historic Park - Wikipedia

   en.wikipedia.org/wiki/Empire_Mine_State_Historic...

   Empire Mine State Historic Park is a state-protected mine and park in the Sierra Nevada mountains in Grass Valley, California, U.S. The Empire Mine is on the National Register of Historic Places, a federal Historic District, and a California Historical Landmark. Since 1975 California State Parks has administered and maintained the mine as a ...

3. Engineered stone - Wikipedia

   en.wikipedia.org/wiki/Engineered_stone

   Engineered stone. Engineered stone is a composite material made of crushed stone bound together by an adhesive to create a solid surface. The adhesive is most commonly polymer resin, with some newer versions using cement mix. This category includes engineered quartz (SiO 2), polymer concrete and engineered marble stone. [1]

4. Central Valley land subsidence - Wikipedia

   en.wikipedia.org/wiki/Central_Valley_land_subsidence

   The Central Valley in California subsides when groundwater is pumped faster than underground aquifers can be recharged. The Central Valley has been sinking (subsiding) at differing rates since the 1920s and is estimated to have sunk up to 28 feet. [1] During drought years, the valley is prone to accelerated subsidence due to groundwater extraction.

5. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [80] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

6. Water reuse in California - Wikipedia

   en.wikipedia.org/wiki/Water_reuse_in_California

   With the population of California expected to nearly double by 2055 [6] and with the anticipated effects of climate change in an already water-strained state, water reuse will continue to be an integral part of California's water story. The State Water Resources Control Board has laid out plans for the increased "use of recycled water over 2002 ...

7. Jedediah Smith Redwoods State Park - Wikipedia

   en.wikipedia.org/wiki/Jedediah_Smith_Redwoods...

   Jedediah Smith Redwoods State Park is a state park of California, United States, preserving old-growth redwoods along the Smith River. It is located along U.S. Route 199 approximately 9 miles (14 km) east of Crescent City. The park is named after explorer Jedediah Smith, and is one of four parks cooperatively managed as Redwood National and ...