Answer: Sedimentary rocks make up 75 percent of the rocks at the earth's surface but only 5 percent of the outer 10 miles of the earth. Sediment, as distinguished from sedimentary rock, is a collective name for loose, solid particles and is generally derived from weathering and erosion of preexisting rock.
Answer:
Option (4)
Explanation:
Here, Speed of light= 
Km/sec
Distance= 
Km
We know that,
=500 sec
=8 minutes 20 sec
Hence, the correct answer is option (4) i.e 8 minutes.
Answer:
False
Explanation:
Chain migration is the social process by which migrants from a particular town follow others from that town to a particular destination, it assures that the mover is part of an established migrant flow from a common origin to a prepared destination,the prepared destination may be in another country or in a new location within the same country
Step migration involves the place transition from, for example, rural to central city residence through a series of less extreme locational changes, from farm to small town to suburb, and finally to the major central city itself
