bentonite, also called nonswelling bentonite. contents history and natural occurrence sodium bentonite calcium bentonite uses for both types see also notes references external links credits bentonite is useful for a wide range of applications. for instance, sodium bentonite is used in drilling mud for oil...
the poaceae comprise about genera and perhaps ten thousand species. it is estimated that grasslands cover about percent of the earth's land area. while the poaceae family comprises those species that are botanically regarded to be "true grasses," the term "grass" is also used for many plants that are not...