What are the two most important alkali metals? why are they so important?

sodium and potassium; lithium and potassium, or francium and lithium are important alkali metal. they are so reactive with air and water, they are generally stored in oil. Cesium and rubidium are used to make atomic clocks. Cesium clocks are considered the most accurate of all clocks. Sodium and potassium both play an important role in biological life on Earth.They are water soluble, basic and very reactive. Alkali metals are the least electronegative group, and tend to react best with nonmetals and water. The sodium and potassium pump are important in maintaining equilibrium amounts both inside and outside the cell.

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion