Beneath the Earth:
Physics can be use to investigate things that cannot be seen directly with the eye. There be a range of techniques avail equal to(p) to geophysicists and archaeologists in the search for in the raw minerals and buried remains. It is very important for us to be able to know what lies underneath the ground so that we can olfactory sensation for raw materials in an environmentally friendly and cost-effective way, pay off sure we argon building on stable ground, discover the past by digging up artefacts.
There are a range of possible techniques that can be used in holy order to find out what is beneath the hide:
* Electrical resistivity
* Velocity of sound waves transmitted through the ground
* comment of radio waves, allowing outgo measurement
* gravitative dramatic art strength
* Magnetic field strength
* Radioactivity
Instruments can be carried in aircraft and can be do sensitive enough t make readings from a distance above the surface, and can look for some(prenominal) anomalies over a large area of land. If earths crust was make of only one material any physical bar measurements would not vary from place to place, however even in places where the crust is reasonably homogenous slight differences occur. This causes some properties such(prenominal) as gravity and magnetism vary.
To find these differences, geophysical surveys are conducted in a structured way.
Measurements are made at regular intervals using a grid system.
* Anomalies arise delinquent to many reasons
* Could be a denser body reserveing useful ores
* Could be a less dense body which may contain lighter materials or hydrocarbons
* Indication of a cave
* Indication of foregoing excavation
Gravity Surveying:
Newtons Gravitational Law
compel between two objects of mass m and M by a distance r is given by
F=GMmr2
The Gravitational Field Strength at any point is the gravitational force on a mass of 1kg at any point,
g= Fm
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