1.
write this expression in standard form: 6.7 x 107107

670.007

67,000,000

670,000
2.
write this expression in standard form: 2.45 x 104104

24.5

24,500

2450
3.
simplify the following expression: 22⋅22=22⋅22=

32

4

16
4.
simplify the expression: b−2⋅b4⋅b=b-2⋅b4⋅b=

b3b3

b−8b-8

b
5.
simplify the expression: c−2⋅c7c-2⋅c7 =

c9c9

c5c5

c−14c-14

50

step-by-step explanation:

answer: the sun

explanation:

water cycle describes the evaporation of water from earth's surface, formation of clouds and precipitation water back onto the surface of earth. seventy percent of the earth is covered with water in the form of seas and oceans. the heat of the sun causes the evaporation of water from the surface of the ocean. the water vapors rise and condense to form water droplets. the collection of these water droplets form clouds which rain down again.

the evaporation of the oceans surface water as part of the water cycle is caused by the sun

i think the answer is 90 hope this