Emotional and cognitive changes. The emotional and cognitive effects of MS are often its greatest challenges. Last updated: 10th November 2016. Some of the most common but hidden symptoms of MS are the changes people may experience related to cognition and their emotions. These changes can affect the way people feel about themselves and alter their cognitive functions. For many, the emotional and cognitive effects of the disease represent its greatest challenges.
A 'Mineral Resource' is a concentration or occurrence of material of intrinsic economic interest in or on the earth's crust in such form, quality and quantity that there are reasonable prospects for eventual economic extraction.
Nonmetallic resources are things like sand, gravel, gypsum, halite, Uranium, dimension stone. A mineral resource is a volume of rock enriched in one or more useful materials. In this sense a mineral refers to a useful material, a definition that is different from the way we defined a mineral back in Chapter 5. Aluminum is the third most abundant mineral in the Earth's crust. 2  It occurs in the most common minerals of the crust-the feldspars (NaAlSi 3 O 8, KalSi 3 O 8, & CaAl 2 Si 2 O 8, but the cost of extracting the Aluminum from these minerals is high.