Fold mountains form when two tectonic plates move towards each other at a convergent plate boundary. Fold mountains form from sedimentary rocks that accumulate along the margins of continents. When plates and the continents riding on them collide, the accumulated layers of rock may crumple and fold like a tablecloth that is pushed across a table, particularly if there is a mechanically weak layer such as salt.
The term is used for most mountain belts, such as the Himalayas.
Q2.‘Norwesters’ are thunderstorms which are prominent in_______.
‘नोर वेस्टर्स या काल बैसाखी” तड़ितझंझा या बिजलीयुक्त तूफान हैं,जो _______में प्रमुख हैं |
(a) India and Bhutan / भारत तथा भूटान
(b) Bhutan and Nepal / भूटान तथा नेपाल
(c) India and Bangladesh / भारत तथा बांग्लादेश
(d) Bangladesh and Myanmar / बांग्लादेश तथा म्यांमार
Nor’westers or the Kalbaishakhi is a local rainfall and thunderstorm which occurs in India and Bangladesh. Kalbaishakhi occurs, with increasing frequency, from March till monsoon establishes over North-East India. Sometimes it might be progressive derechos. During this time Odisha, West Bengal, Assam, Bihar, Chhattisgarh, Jharkhand, Bangladesh and North-Eastern states of India are affected by violent thunderstorms.
Q3. _________ is a cold desert lying in the Great Himalayas.
_____ बृहत् हिमालय में स्थित एक ठंडा रेगिस्तान है|
Mulching – Mulching is the process of covering the topsoil with plant material such as leaves, grass, twigs, crop residues, straw etc. A mulch cover enhances the activity of soil organisms such as earthworms. They help to create a soil structure with plenty of smaller and larger pores through which rainwater can easily infiltrate into the soil, thus reducing surface runoff. As the mulch material decomposes, it increases the content of organic matter in the soil. Soil organic matter helps to create a good soil with stable crumb structure. Thus the soil particles will not be easily carried away by water. Therefore, mulching plays a crucial role in preventing soil erosion.
Intercropping – Intercropping is a multiple cropping practice involving growing two or more crops in proximity. The most common goal of intercropping is to produce a greater yield on a given piece of land by making use of resources or ecological processes that would otherwise not be utilized by a single crop.
Rock dam – Check dams, also called ditch checks, dikes, wattles, etc., are temporary or permanent linear structures placed perpendicular to concentrated flows such as in drainage ditches, channels, and swales to reduce flow velocities and prevent channel down-cutting. Some sediment trapping may occur during low flows. Check dam materials may include rock, fiber logs (e.g., wattles), triangular sediment dikes, sand bags, and other materials or prefabricated systems.
Terrace farming – Terrace farming, method of growing crops on sides of hills or mountains by planting on graduated terraces built into the slope. Though labour-intensive, the method has been employed effectively to maximize arable land area in variable terrains and to reduce soil erosion and water loss.
Q5. Alps mountain range is located in which continent?
The Intertropical Convergence Zone (ITCZ), known by sailors as the doldrums, is the area encircling Earth near the Equator, where the northeast and southeast trade winds converge. The ITCZ appears as a band of clouds, usually thunderstorms, that encircle the globe near the Equator.
Q7. The boundary between Earth’s crust and mantle is _____.
पृथ्वी के भूपर्पटी तथा मैंटल के बीच की सीमा _____ है|
The Mohorovicic Discontinuity, or “Moho,” is the boundary between the crust and the mantle.
The Lehmann discontinuity is an abrupt increase of P-wave and S-wave velocities at the depth of 220±30 km, discovered by seismologist Inge Lehmann. It appears beneath continents, but not usually beneath oceans, and does not readily appear in globally averaged studies
The Conrad discontinuity corresponds to the sub-horizontal boundary in continental crust at which the seismic wave velocity increases in a discontinuous way.
The Gutenberg discontinuity occurs within Earth’s interior at a depth of about 2,900 km (1,800 mi) below the surface, where there is an abrupt change in the seismic waves (generated by earthquakes or explosions) that travel through Earth.
Q8. Doldrums pressure belts lies in between which of the following latitudes?
डोलड्रम्स दवाब क्षेत्र निम्नलिखित में से किन दो अक्षाशों के मध्य स्थित है?
Doldrums are placed at five degrees north and south of the equator. Meanwhile, horse latitudes are located at30 degrees north and south latitude. 3.The air existing in doldrums is moist, while horse latitudes’ air is dry.
Q9. Which of the following planet is also known as ‘Earth’s twin’?
निम्नलिखित में से कौन से ग्रह को ‘पृथ्वी का जुड़वां’ भी कहा जाता है?
Venus is sometimes called Earth’s twin because Venus and Earth are almost the same size, have about the same mass (they weigh about the same), and have a very similar composition (are ,made of the same material). They are also neighbouring planets.
Q10. Which of the following imaginary lines join places with same level of rainfalls?
निम्नलिखित में से किस काल्पनिक रेखा के द्वारा समान वर्षा स्तर वाले स्थानों को जोड़ा जाता है?