This magmatic rock consists of volcanic glass (SiO₂,MgO,Fe₃O₄). It is the homogeneous volcanic glass with small water content. Therefore obsidian is very brilliant. In the ancient time made mirrors of it.
Answer:
The Earth:
- Is tilted 23 1/2° on its axis
.
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Rotates from west to east
.
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Bulges slightly at the equator
.
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Revolves around the sun once every 365 1/4 days
.
Explanation:
The only option that is incorrect is the first one - The Earth has a circular orbit around the sun-. Although the Earth has an orbit around the sun, this one is not circular, it is elliptical, this is similar to an inclined oval, and the planet rotates in this orbit with an inclination on its axis of 23 1/2º.
As well as the shape of the orbit is not circular, the shape of the Earth is not equal in all its parts, it is wider in the equator in comparison with the North and South Poles.
It rotates from west to east in its axis, and it takes 365 1/4 days to complete a round in its orbital.
Answer:
Metal.
Explanation:
Metal has the smallest iconic radius in the alkaline earth metal.
Data Given:
Moles = n = 3.91 mol
Pressure = P = 5.35 atm
Temperature = T = 323 K
Volume = V = ?
Formula used: Ideal Gas Equation is used,
P V = n R T
Solving for V,
V = n R T / P
Putting Values,
V = (3.91 mol × 0.0825 atm.L.mol⁻¹.K⁻¹ × 323 K) ÷ 5.35 atm
V = 19.36 L
