ANSWER:
Rivers are very important for a country's economy as many trades take place through rivers .
Also many new ideas and comodities spread across the eorld through sea routes .
Also ideas of new technologies,achievements in medical science get across the world through rivers and seas.
Even sometimes some special things that need to taken from one country to another with high security are taken through rivers.
There can be many more reasons for rivers being important for a country's economy.
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Answer:
Radiometric dating is usually defined as a method that helps in calculating the age of rock depending on the presence of radioactive isotopes and its rate of decay. In order to calculate this, the half-life of the isotope element must be known. This method is commonly used by geologists.
The conditions that are needed to fulfill in order to determine the age of a granitic batholith are as follows-
- The rate at which these materials decay must be a constant
- There should be an exact amount of both the parent as well as the daughter elements.
- Since it is a batholith, so it has formed from the crystallization of magma at a certain depth. So, these granitic rocks must have remained within a closed system, right from the time of its formation.
The various methods of radiometric dating that can be used to date this granitic batholith are-
- Uranium-lead dating- It is an efficient method to date the rocks that are of about 4 to 4.5 billion years.
- Potassium-argon dating- It is also commonly used to date rocks that are about 4 billion years old.
Answer:
<u>Metamorphic rocks being the third great class of rocks found in environment full of pressure pressure and strain. </u>
Explanation:
- Metamorphic rock is the transformation of the existing rocks through a process of metamorphism i.e change in forms. It is subjected to heat at 200 degrees that causes profound chemical and physical changes.
- The primary or contact metamorphism is the name given to the process that takes place in the magma when injected the surrounding solid rocks as temperatures are highest at the boundaries.
- T<u>emperature and pressure</u> are the most primary factors, regional metamorphism also called the dynamic metamorphism is the name given to the changes in the rock types due to the greater depths are subjected to horizontal tectonic pressure thus giving a gneissic type texture where minerals ten to the subject in bands.
- Foliation is the form when pressure squeezes the flat and elongated rock minerals, which develops into sheets reflecting the direction of pressure.
Answer:
A: The Indian Ocean and the Pacific Ocean.
Explanation:
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