I uploaded the answer to a file hosting. Here's link:
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The only cause we know of that could shift the spectrum of a source toward longer wavelengths isthe source moving away from us. That's how we interpret the red shift when we see it, and that's where the whole idea of the expanding universe comes from. But ... just like gravity and the Earth going around the sun ... it can't be proved, so it's "only a theory".
A)They are all classified as pure substances.
Explanation:
The different component gases that makes up the air are classified as pure substances.
What are pure substances?
- They are elements and compounds.
- They have definite composition.
- All the parts are the same throughout
- They have a unique set of physical properties.
learn more:
Air as a mixture brainly.com/question/10897667
#learnwithBrainly
Answer:
D). She should use a bar graph. The bottom of each bar should be labeled with the category of garbage. The vertical side should have a scale and be labeled "kilograms per year."
Explanation:
Bar graphs are characterized as the graphic tool which are primarily employed to establish comparison between various groups or to observe the changes occurred over time.
As per the question, the environmental scientist must opt for the 'bar graph' as it will assist her in displaying the data of various categories(paper, yard waste, metals, etc.) through bars on the x-axis while the vertical side or y-axis would show 'kilograms per year' which will display the differences in their amounts. Thus, <u>option D</u> is the correct answer.
