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Amanda [17]
3 years ago
9

The main source of energy for life on earth is ____? Dirt Nuclear radiation Sun

Chemistry
1 answer:
sdas [7]3 years ago
5 0

Answer:

Sun it is the sun bcz the Sun is the major source of energy for organisms and the ecosystems 

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Temperature cloud cover and thunder are all examples of
Umnica [9.8K]

Temperature, cloud cover and thunder are all examples of weather.  

<h3><u>Explanation:</u></h3>

Weather is described as conditions that prevail for a short period of time and the above-mentioned factors change variably throughout the day. Cloud cover simply describes the clouds coverage in the sky. It is one factor that is used to describe weather conditions since the type of clouds indicates prevailing weather.

For example, the presence of cirrus means there will be a storm in 24 to 48 hours. Weather conditions characterized by thunder is said to be stormy and it also has other conditions such as lightning, wind and fast rain with heavy raindrops. Temperature affects the warmness and coldness of the air and its movement. Moreover, it also affects all other aspects of weather conditions.

7 0
4 years ago
A light-year is a way to measure ______ in space.
kirill115 [55]

Answer:

Distance

Explanation:

The light-year is a measure of distance, not time. It is the total distance that a beam of light, moving in a straight line, travels in one year.

4 0
3 years ago
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In the past earths sea level has sometimes been lower at that time which of the following would have been a major difference in
valina [46]
The answer which would have been a major difference in the ocean basins is the following one:
<span>B. Mid-ocean ridges would have been chains of mountains.

Given that the waters were lower in the past, those ridges would no longer be just mid-ocean ridges, but complete mountains due to the low levels of water around them.</span>
8 0
3 years ago
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Which statement is true about this reaction? mc016-1.jpg
Julli [10]
C because,  its products is heavier than each of its reactants
8 0
3 years ago
The ksp of yttrium fluoride, yf3, is 8.62 × 10-21. calculate the molar solubility of this compound.
motikmotik

Answer:

The molar solubility of YF₃ is 4.23 × 10⁻⁶ M.

Explanation:

In order to calculate the molar solubility of YF₃ we will use an ICE chart. We identify 3 stages: Initial, Change and Equilibrium and we complete each row with the concentration of change of concentration. Let's consider the solubilization of YF₃.

       YF₃(s) ⇄ Y³⁺(aq) + 3 F⁻(aq)

I                       0               0

C                     +S            +3S

E                       S              3S

The solubility product (Ksp) is:

Ksp = [Y³⁺].[F⁻]³= S . (3S)³ = 27 S⁴

S=\sqrt[4]{Ksp/27} =\sqrt[4]{8.62 \times 10^{-21}  /27}=4.23 \times 10^{-6}M

6 0
4 years ago
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