Which of the following statements are true about partial melting? Choose one or more: A. Mafic components of the parent rock tend to go into the liquid state first during partial melting. B. Felsic components of the parent rock tend to go into the liquid state first during partial melting. C. Partial melting results in magmas that are more felsic in composition than the parent rock. D. As more of the rock melts during partial melting, the magma becomes more mafic than the original melt that formed.

B. (Felsic components of the parent rock tend to go into the liquid state first during partial melting.)

C. (Partial melting results in magmas that are more felsic in composition than the parent rock.)

D. As more of the rock melts during partial melting, the magma becomes more mafic than the original melt that formed.

The correct options are B,C, D.

Explanation:

The mafic components of a rock are the components that are rich in Magnesium and ferric oxides. They are the major constituents of an igneous rock. They are usually dark in colour and have high specific gravity.

Felsic components of a rock on the other hand are rich in silicate minerals, oxygen, aluminium, sodium and potassium. They have a lighter colour than the mafic components, with low specific gravity. Thus, the felsic components of the parent rock tend to go into the liquid state first during partial melting and not the mafic components.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.