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  1. Refers to substances or rocks that have a high pH value (greater than 7) and are basic in nature. In the context of igneous rocks, alkaline rocks have relatively high levels of alkali metals like potassium and sodium.
  2. 2. A type of igneous rock that has a relatively high content of alkali metals (such as potassium and sodium) and low silica content. Alkaline rocks typically form in regions associated with volcanic activity.