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zubka84 [21]
2 years ago
10

PLEASE HELP!! 20 POINTS!

Chemistry
2 answers:
SpyIntel [72]2 years ago
7 0
It's something to do with the weathering process. Eg. At night it's really cold, and in the day it's really hot. Because the temperature keeps changing dramatically day in and day out, the sand dunes start to be sort of hacked or re-shaped, or even formed.
Free_Kalibri [48]2 years ago
4 0

Hi there!

This "phenomenon" happens because of erosion caused by wind and deposition. Wind picks up grains of sand and deposits it when the sand encounters an obstacle (in this case, a sand dune or the like). Because the sand is not held in place like soil, the dunes are constantly changing, allowing for varied shapes and sizes of the dunes every year Eli and his family visit.

I hope that helps you out! Have a great day! :)

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When an ionic bond forms between lithium (Li) and fluorine (F), which of the following occurs?
allochka39001 [22]
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3 0
3 years ago
Read 2 more answers
When cream mixes with coffee, is this a chemical or physical change?
svlad2 [7]

It is a physical change when cream mixes with coffee, it changes the color of the coffee. When you add more or less cream there is a color change depending on the consistency of cream. The properties are not changes and a no new compound is formed as in chemical change with a reaction of two compounds, a new compound is formed with different properties. So it is a physical change.

7 0
2 years ago
Equation 3x-5=-2x+ 10?<br> O<br> 0<br> x= 5<br> -5 = x<br> -15 = -5x<br> -5x = 15
Harman [31]

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are those the answer choice

7 0
3 years ago
A 0.0372-m3 container is initially evacuated. Then, 4.65 g of water is placed in the container, and, after some time, all of the
Montano1993 [528]

Answer:

18.3 kilopascals

Explanation:

We are given that the volume of this container is 0.0372 meters^3, that the mass of water is 4.65 grams, and that the temperature of this water vapor ( over time ) is 368 degrees Kelvins. This is a problem where the ideal gas law is an " ideal " application.

_______________________________________________________

First calculate the number of moles present in the water ( H2O ). Water has a mass of 18, so it should be that n, in the ideal gas law - PV = nRT, is equal to 4 / 18. It is the amount of the substance.

We now have enough information to solve for P in PV = nRT,

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P ≈ 18,276.9

Pressure ≈ 18.3 kilopascals

<u><em>Hope that helps!</em></u>

5 0
3 years ago
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