The mean radius of the earth is 6,371 km, and 70.8% of its surface is covered by water. what is the surface area of the earth covered by land?

In a floral arrangement, the focal area is often

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

Iwll give extra points to who gets this for ! what type of reaction is this? ?