Q.3. Consider the following :

1. Pyroclastic debris.
2. Ash and dust
3. Nitrogen compounds.
4. Sulphur compounds
5. Minor amounts of Hydrogen and Argon

Q.1. Earthquake waves get recorded in seismographs located at far off locations. However, there exist some specific areas where the waves are not reported called the shadow zone.

Consider the following statements in context with the same:

1. The seismographs located beyond 145° from epicentre, record the arrival of S- waves, but not that of P-waves.

2. The entire zone beyond 105° does not receive P-waves.

3. The shadow zone of S-waves is not only larger in extent but it is also a little over 40 per cent of the earth surface.

Q.2. Which type of volcanic eruptions have caused Deccan Trap formations ?

A. Shield
B. Flood
C. Composite
D. Caldera

Q.3.Consider the following statements :

1. P-waves (Primary waves) travel through gaseous, liquid and solid materials. whereas S-waves (Secondary waves) can travel only through solid materials.

2. P-waves (Primary waves)move faster and are the first to arrive at the surface whereas the Surface waves are the last to report on seismograph.

Q.1. With reference to earthquake waves, consider the following statements :

1. P-waves vibrate parallel to the
direction of the wave.

2. The direction of vibrations of S-waves is perpendicular to the wave direction in the vertical plane.

3. P waves create troughs and crests in the material through which they pass.

4. S waves exerts pressure on the material in the direction of the propagation creating density differences in the material leading to stretching and squeezing of the material.

Q.2.Which of the following are the evidences of the phenomenon of continental drift ?

1. The shorelines of Africa and South America facing each other have a remarkable and unmistakable match.

2. The belt of ancient rocks of 2,000 million years from Brazil coast matches with those from western Africa..

3. The occurrence of rich placer deposits of gold in the Ghana coast whereas the gold bearing veins are in Brazil.

4. The observations that Lemurs occur in India, Madagascar and Africa led some to consider a contiguous landmass "Lemuria" linking these three landmasses.

Q.3.Consider the following pairs :

1. Cocos plate : Between South America and Pacific plate

2. Nazca plate : Between Central America and Pacific plate

3. Arabian plate : Mostly the Saudi Arabian landmass

4. Philippine plate : Between the Asiatic and Pacific plate

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Q.1. Which one of the following is the type of plate boundary along the San Andreas fault ?

A. Ocean-continent convergence
B. Divergent boundary
C. Transform boundary
D. Continent-continent convergence

Q.2.Consider the following statements :

1. It was realised that all along the midoceanic ridges, volcanic eruptions are common and they bring huge amounts of lava to the surface in this area.

2. The rocks equidistant on either side of the crest of mid-oceanic ridges show remarkable similarities in terms of period. of formation, chemical compositions and magnetic properties.

3. The belt of ancient rocks of 2,000 million years from Brazil coast matches with those from western Africa.

4. The ocean crust rocks are much younger than the continental rocks.