Which material most likely has the highest level of permeability? a. sand b. clay c. gravel d. silt

Silt

Explanation:

Permeability is what allows liquids or gasses to flow through or pas through a material.

Silk has the highest level of permeability, causing gasses and liquids to easily flow through it.

Sand, clay and gravel do not have high levels of permeability. That is why these substances are used to filter water. They do not allow liquids or gasses to easily flow through them, causing them to loose any dirt or physical sustenance.

Mordancy.

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.