Explanation:
Earth's thin outer shell is broken into big pieces called tectonic plates. These plates fit together like a puzzle, but they're not stuck in one place. They are floating on Earth's mantle, a really thick layer of hot flowing rock.The edges of tectonic plates are called boundaries.Most earthquakes occur along the edge of the oceanic and continental plates. The earth's crust (the outer layer of the planet) is made up of several pieces, called plates. ... Earthquakes usually occur where two plates are running into each other or sliding past each other.
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Answer: Unconformity is the procedure between two rocks having a contact. It is usually observed that upper unit of rock is younger in nature compared to the lower unit of rock.
Explanation: There are different types of unconformities such as:
- Disconformities- it is a uncoformity which has a parallel nature along with the rocks in the sedimentary form during the phase of erosion
- Non-conformities - it is a unconformity that creates the separation between the sedimentary rocks and other rocks like igneous rocks. They usually display the erosion that has occurred long time back.
- Angular unconformities-it is also a type of separation that is present between the younger rocks and the older rocks units.
The disc which contains spiral arms of the galaxy part would be used to study the birth starts in a spiral galaxy
Explanation:
- A galaxy has four parts and they are bulge, disc, spiral arms and halo
- Bulge primarily contains old stars, gas and dust.
- The disc contains the spiral arms also, it is the flattened portion of the spiral arms where we could find most of the young stars, gas and dust. Some old stars are also found in this region
- Spiral arms are only found in spiral galaxies. It is the curved extension begins from the bulge. Here, also you could find young stars, dust and gas.
- Halo is the part where we could find clusters or individual old starts and also the dark matter. The dark matter we can't see but can estimate the gravitational force.
The largest SAND desert is the Sahara Desert. It is located in North Africa :)
