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A century ago, swords were made from various metals, especially steel. The property that makes steel a good choice for

sword making is

tensile strength

ductility

strength

conductivity

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The property that makes steel a good choice for sword-making is strength

Explanation:

The strength of a material is its ability to withstand an applied load or force without failure or plastic deformation.  Types of strength of materials include; tensile strength, yield strength, torsional strength, compressional strength, shear strength.

Tensile strength of material is the ability of that material to withstand any force that tends to break or tear it apart. It is calculated by dividing the maximum amount of load or force the material can carry or withstand without breaking by the surface area of the material.

Mathematically, Tensile strength = Force/area

Its unit is Newton per meter squared, N/m².

Yield Strength In Steel

Yield strength is the maximum stress that can be applied before it begins to change shape permanently. Yield strength represents the upper limit of the load that can be safely applied to the meta beyond which it shape deforms.

Steel is an alloy of iron and carbon. It has many important and desirable properties such as durability, hardness and conductivity, and high tensile strength. However, the high strength of steel made a good choice for sword-making in the ancient past and even in the present.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.