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ElenaW [278]
3 years ago
8

What is an ephemeral stream? A)one that flows only after rainfall B) one that flows only in flat lands C) one that is formed onl

y from mechanical weathering D) one that is formed only from chemical weathering
Chemistry
1 answer:
kupik [55]3 years ago
5 0

Answer: Option (a) is the correct answer.

Explanation:

The stream that flows during or after the rainfall is called an ephemeral stream. This stream occurs in areas where there is less rainfall or deficiency of moisture.

The stream that flows only in flat lands is called as river.

Mechanical weathering results in the breaking of rocks causes ice wedging.

Chemical weathering results in the change in molecular structure of rocks and soil.

Thus, it can be concluded that option (a) is the correct answer.


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During a volcanic eruption, lava flows at a rate of 26m/min. At this rate how far in kilometers can lava travel in 37 minutes?
MAXImum [283]

Answer:

Like stratovolcanoes, they can produce violent, explosive eruptions, but their lava generally does not flow far from the originating vent. Cryptodomes The 1980 eruption of Mount St. Helens was an example; lava beneath the surface of the mountain created an upward bulge which slid down the north side of the mountain.

Explanation:

3 0
3 years ago
Niven wants to calculate the mass of MgO that is produced by the burning of 28.0 g of Mg. What is the first step in Niven’s calc
Elanso [62]
I would say that Niven would have to calculate the atomic weights of Mg and O and then the total weight of MgO to get the percent of oxygen and then that way get a proportionate amount of the 28 grams of oxygen required to bond with the Mg and then add together the weight of Mg which would be 28.0 grams plus the weight of oxygen.
8 0
3 years ago
Read 2 more answers
2.5 moles of a gas is enclosed in a 87.2 L cylinder with a moveable piston at 425 K and 1.0 atm. An additional 2.5 moles of gas
Nesterboy [21]

Answer:

112 L

Explanation:

Since the pressure is being held constant, you can use the following variation of the Ideal Gas Law to find the new volume:

\frac{V_1}{T_1N_1}=\frac{V_2}{T_2N_2}

In this equation, "V₁", "T₁", and "N₁" represent the initial volume, temperature, and moles. "V₂", "T₂", and "N₂" represent the final volume, temperature, and moles.

V₁ = 87.2 L                             V₂ = ? L

T₁ = 425 K                              T₂ = 273 K

N₁ = 2.5 moles                       N₂ = 2.5 + 2.5 = 5.0 moles

\frac{V_1}{T_1N_1}=\frac{V_2}{T_2N_2}                                                   <----- Formula

\frac{87.2 L}{(425K)(2.5 moles)}=\frac{V_2}{(273 K)(5.0 moles)}                    <----- Insert values

\frac{87.2 L}{1062.5}=\frac{V_2}{1365}                                                    <----- Simplify denominators

0.08207=\frac{V_2}{1365}                                                 <----- Simplify left side

112L={V_2}                                                        <----- Multiply both sides by 1365

4 0
1 year ago
How many moles are present in 281 grams of arsenic
Murljashka [212]
The molar mass or As is 74.9g. Start with 281g multiply by (1mol/74.9g) = 3.75 mols

Put what you don’t want on the bottom (in this case grams) so they the u it’s cancel (if you multiply by grams and the divide by grams they cancel. Ultimately leave what you want on the top ( This case mols) then do the math
6 0
3 years ago
A student with a body temperature of 37°C holds a piece of ice that has a temperature of –8°C.
Andrei [34K]

Answer:

B

Explanation:

Heat moves as thermal energy from hot body to a cold body

don't forget to rate answer

8 0
3 years ago
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