Spain and Portugal (circled on the map above) are located on the __________ Peninsula, a landform that is separated from the rest of Europe by the Pyrenees.

Answer:

Acidic rain can damage the soil, leaves, and severely impact the air quality.

Explanation:

• Acidic rain contains sulfur content which is quite harmful to the soil and air and decreasing their ability to photosynthesis, also this rain causes loss of critical nutrients from the soil.  

• When lakes and streams become acidic they kill the fish population as they are sensitive to the acid reaction. These streams that are higher elevations receive a greater amount of rainfall as compared to the lower streams.

• The toxic rain causes aluminum, lead and other harmful chemicals to escape and mix with the soil layer deep below in additional the acid from the acidic clouds and fog that often surround them thus leading to a high concentration of acid deposits.

The answer is The unsorted sand and rock is the least porous. The porousness of a solid material is dependent on the size of holes within it. This can be tested by how quickly, the material can pass a liquid through it. The bigger the holes, the higher the porousness, In this case, the unsorted sand and rock have the smallest holes between its particles.

Large pebbles and boulders materials is the least porous. Correct option is D.

Large pebbles and boulders are the least porous among the given options. Porosity refers to the percentage of void space or openings (pores) within a material that can hold fluids like water, air, or other substances. It is a measure of how much empty space exists within the material.

In the given options:

a. loosely packed gravel: Gravel generally has larger particles and may have relatively higher porosity compared to other options.

b. sorted sand and rock: Sorted sand and rock may have some porosity depending on the grain size and how well-packed the particles are, but it is likely to be less porous than loosely packed gravel.

c. unsorted sand and rock: Unsorted sand and rock may have varying porosity depending on the mixture, but it is likely to be less porous than loosely packed gravel.

d. large pebbles and boulders: Large pebbles and boulders have minimal pore space compared to the other options. The particles are relatively large and leave less room for open space between them, resulting in lower porosity.

So, the material with the least porosity among the given options is "d. large pebbles and boulders."

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Complete question is:

Which of the following materials is the least porous?

a. loosely packed gravel

b. sorted sand and rock

c. unsorted sand and rock

d. large pebbles and boulders