How far has manned space exploration reached?a. Mars
b. Jupiter
c. the Moon
d. Earth's orbit

Final answer:

The Earth's core, which is composed of iron and nickel, is the layer referred to in the question. It's divided into an outer core, which is hot and liquid, and an inner core that's solid due to intense pressure.

Explanation:

The layer of the Earth composed of iron and nickel, with two main parts called the outer and inner sections, is the core. The core is the deepest layer of the earth and is divided into the Outer Core and the Inner Core. The Outer Core, which borders the mantle, and the Inner Core, the earth's center, are both primarily made up of iron and nickel. The outer core is fluid and hot, while the inner core is solid due to extremely high pressure. These metallic elements give the core its significant density and heat conductivity.

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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

Answer:

Yes

Explanation:

• As the field of earth science deals with both the natural and planetary sciences the field is a branch that continuously deals and forms other science like the climatology top study of the earth's atmosphere of the earth and other planets.

• Form geology studies the lithospheric elements of the earth and thus studies the biosphere and the biogeochemical cycles. From the hydrosphere it studies the oceanic and groundwater components like exploring the seabed, crawling through caves.

• Thus it has various fields of study like the physical geography, geophysics, geochemistry, ecology, glaciology the soil and atmospheric science. Impact of plate tectonics, volcanism and the magnetic fields of the earth are all career domains of knowledge.