geomorphology & earth landforms section 2 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Latitude is a geographic coordinate that specifies the north-south position of a point on the Earth's surface.

The lines of constant latitude, or parallels, run east–west as circles parallel to the equator. Latitude is an angle (defined below) which ranges from 0° at the Equator to 90° (North or South) at the poles.

Answer: (d)

The Tropic of Cancer passes through Algeria, Niger, Libya, Egypt, Saudi Arabia, United Arab Emirates, Oman, India, Bangaladesh, Myanmar, China, Mexico, Bahamas, Mauritinia, Mali etc.

Answer: (a)

Hydrolysis is the weathering reaction that occurs when the two surfaces of water and compound meet. It involves the reaction between mineral ions and the ions of water (OH- and H+), and results in the decomposition of the rock surface by forming new compounds. Temperatures usually stay high (above 70) throughout the year.

Humid Subtropical climate is known for hot humid summers. During the summer the average temperature is between 70 and 80 degrees.

Answer: (b)

Highly viscous lava tends to entrap gas, which forms vesicles (bubbles) within the rock as they rise to the surface. Lava with low viscosity tends to easily release bubbling gases as they are formed.

Lavas also may contain many other components, sometimes including solid crystals of various minerals, fragments of exotic rocks known as xenoliths and fragments of previously solidified lava. Volcanic eruptions are caused by magma (a mixture of liquid rock, crystals, and dissolved gas) expelled onto the Earth’s surface.

At depth in the Earth, nearly all magmas contain gas dissolved in the liquid, but the gas forms a separate vapour phase when pressure is decreased as magma rises toward the surface of the Earth. This is similar to carbonated beverages which are bottled at high pressure. The high pressure keeps the gas in the solution in the liquid. Gas gives magmas their explosive character because the volume of gas expands as pressure is reduced.

Answer: (c)

Answer: (b)