What element is the only 4th period Alkali Metal

For the following, determine the type of reaction and then give products.

About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question

Joan writes four numbers on the board in standard form, and then she writes their scientific notation