Although the light year is a
commonly used unit, astronomers
prefer a different unit called the parsec (pc). A parsec, equal to 3.26
light years, is defined as the distance at which 1 Astronomical Unit subtends an
angle of 1 second of arc (1/3600 of a degree) When we use the parsec for really
large distances, we often put a prefix in front of it - like kiloparsecs (kpc),
which are equal to 1000 parsecs - or Megaparsecs (Mpc), equal to a million
parsecs.
The Milky Way is about 1,000,000,000,000,000,000 km
(about 100,000 light years or about 30 kpc) across. The Sun does not lie near
the center of our Galaxy. It lies about 8 kpc from the center on what is known
as the Sagittarius arm of the Milky Way.
In this question, we are not provided with the image of the dinosaur track. Because of this, we are unable to tell whether this specific track is right-side up or upside-down. However, we can give you some guidance so that you can identify this on your own.
In general, in this type of prints, mud cracks extend downward into soft sediment. These cracks mean that when more sediment is washed in, the second layer fills the cracks beneath. Afterwards, once the layers have hardened, the rock may be cracked apart. Based on this, we can conclude that if you see troughs in a mud-crack pattern, you re looking at the second layer, which was originally right-side up.
<h2>Answer: D. Rayleigh wave
</h2>
Rayleigh waves are a type of surface acoustic wave that causes particles on the surface of solids to travel along an elliptical path in the vertical plane that contains the direction of wave propagation.
These waves include longitudinal (P wave) and transverse (S wave) movements whose amplitude decreases exponentially as the distance from the surface increases.
This means Rayleigh waves are generated by the interference between the P and S waves on the surface of the Earth.
Answer:
Poem dedicated to his Mom, Grandma, Aunt.
Explanation:
