204. The two ‘equinoxes’ take place respectively in the months of

A. January and June
B. July and December
C. March and September
D. September and December
✅ The correct answer is option C.
An equinox is commonly regarded as the instant of time when the plane (extended indefinitely in all directions) of Earth’s equator passes through the center of the Sun. This occurs twice each year, around 20 March and 23 September.

205. The process of weathering results into

A. the complete loss of particular atoms or the compounds from the weathered surface
B. the addition of specific atoms or compounds to the weathered surface
C. a breakdown of one mass in to two or more masses, with no chemical change in the mineral or rock
D. All of the above
✅ The correct answer is option D.
All of the above

207. The model which explains the various types of igneous rocks

A. rock cycle
B. Bowens reaction series
C. both are similar terms
D. None of the above
✅ The correct answer is option B.
This model, known as the Bowen reaction series, suggests that the type of igneous rocks that form from magma solidification depends on the temperature of crystallization and the chemical composition of the originating magma.