Physical Geography Lithosphere

Explanation

The evidences of the phenomenon of continental drift include the matching ancient rocks from Brazil coast and Western Africa, the gold deposits of Ghana derived from the Brazil plateau, and the presence of Gondwana system sediments from India in six different landmasses of the Southern Hemisphere. These examples support the theory of continental drift proposed by Alfred Wegener, highlighting the past connections between continents that have since drifted apart.

Explanation

Chalk is a very permeable rock due to its porosity, allowing it to absorb water. On the other hand, clay is considered quite impermeable or least permeable, as it has very low porosity, making it difficult for water to pass through. This difference in porosity between chalk and clay explains why chalk is known for being permeable while clay is known for being impermeable.

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Pyroclastic debris, ash and dust, nitrogen compounds, and sulfur compounds are all products of volcanic eruptions. During volcanic eruptions, these materials are ejected from the volcano and can have various impacts on the environment and climate.

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Rainwater contains carbon dioxide and atmospheric oxygen, which can react with minerals in rocks during weathering processes. Carbon dioxide in rainwater forms carbonic acid, which can dissolve minerals in rocks, leading to their weathering. Additionally, atmospheric oxygen can also contribute to the oxidation of minerals in rocks, further aiding in their breakdown.

Explanation

In a seismograph, P waves are recorded earlier than S waves because P waves are faster than S waves. P waves cause particles to vibrate in the direction of wave propagation, while S waves cause particles to vibrate perpendicular to the direction of wave propagation.

Explanation

The black cotton soil in India has been formed due to the weathering of fissure volcanic rock. This type of soil is known for its high clay content, which is a result of the weathering process of volcanic rocks. The presence of minerals like montmorillonite gives the soil its characteristic black color and unique properties.

Explanation

The evolution of organisms might have been influenced by both Continental drift and glacial cycles. The final stages of the evolution of the Genus Homo took place during the last three glacial cycles.

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The correctly matched pair among the options given is (b) Atlas Mountains : North-Western Africa. The Atlas mountain ranges span nearly 2000 km in the north-western region of Africa, passing through countries such as Morocco, Algeria, and Tunisia.

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The changing lengths of daytime and nighttime throughout the seasons occur because the Earth revolves on a tilted axis.

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Various factors contribute to the dynamic changes on Earth's surface. These include electromagnetic radiation, geothermal energy, gravitational force, plate movements, the rotation of the earth, and the revolution of the earth. These elements collectively influence the surface of the earth, leading to continuous changes.

Explanation

Asteroids and comets have distinct differences. Asteroids are small rocky celestial bodies, while comets are composed of frozen gases held together by rocky and metallic material. Asteroids are primarily located between the orbits of Jupiter and Mars, whereas comets are typically found between Venus and Mercury. One key distinguishing feature is that comets display a noticeable glowing tail, while asteroids do not. Therefore, the correct statements are 1 and 3 only, making the answer (b).

Explanation

The land covered with fresh snow reflects the most sunlight compared to the other options given - a sand desert, paddy crop, and prairie land. This is because snow has the highest albedo among them.

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Among the given options, Jupiter has the highest number of natural satellites or moons, with a total of 63. Saturn follows closely behind with 61 moons, while Mars has 2 moons and Venus does not have any moons.

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In the composition of planet Earth, the core beneath the mantle is primarily composed of iron and nickel.

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To express the height of a person who is six feet tall in nanometers, we can convert feet to centimeters. Given that 1 foot is equivalent to 30.5 centimeters, 6 feet would be 183 centimeters. Therefore, the approximate height in nanometers would be 183 × 10^7 nanometers, which corresponds to option (c).

Explanation

In the comparison between Mars and Earth orbiting the Sun, it is a fact that Mars takes less time to complete one revolution around the Sun than Earth. The reason for this is not due to the diameter of Mars being smaller than Earth, as stated in the Reason. The correct explanation is that Mars' orbital period is approximately 1.88 Earth years, making Assertion (A) false.

Explanation

In the context of Physical Geography, the assertion that the same face of the moon is always facing the earth is supported by the fact that the moon completes one rotation on its axis in approximately 27.322 days. This phenomenon is closely aligned with the time it takes for the moon to orbit the earth. The reason given is that the moon's rotation period and its orbital period are nearly the same. The correct option in this scenario is (c), where the assertion is true but the reason is false.

Explanation

The Earth's magnetic field is tilted at an angle of 23 and a half degrees in relation to the geographic axis. The magnetic pole in the Northern Hemisphere is situated on a peninsula in Northern Canada. The Earth's magnetic equator runs through Thumba in South India. The correct statements are 2 and 3, making option (b) the correct choice. Original: Earth's magnetic field is inclined between –90° to 90°. In the northern hemisphere it points downwards and upward in the southern hemisphere. Rewritten: The Earth's magnetic field ranges from -90° to 90° in inclination. It points downward in the northern hemisphere and upward in the southern hemisphere.

Explanation

Jupiter takes the longest time to complete one orbit around the Sun, which is 11 years and 86 days. In comparison, Mars takes 687 days, and Venus takes 267 days.

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In our solar system, the correct statement is that the Earth is the densest planet. Earth's density is 5.52, while Venus has a density of 5.50, Mercury 5.27, and Mars 3.95.

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The first person to assert that the Earth was round was Aristotle in 340 B.C. He made this claim in his book 'On the Heaven'.

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Sedimentary rocks are formed on the Earth's surface through the hydrological system, involving the weathering of existing rocks. These rocks often contain fossils and are commonly found in layers. Hence, all the statements presented regarding sedimentary rocks are correct.

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Volcanic eruptions are not found in the Baltic Sea. This is because the basaltic rock present in the Baltic Sea has been carried there by glaciers.

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Quartzite is formed through the process of metamorphism from sandstone.

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In the process of soil erosion, the correct order is splash erosion, sheet erosion, rill erosion, and gully erosion, as presented in option (a).

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In the figure provided, the physical regions labeled as 1, 2, 3, and 4 correspond to the Andes, Brazilian Shield, Guyana Highlands, and Amazon Basin respectively. The correct option is (a) Andes, Brazilian Shield, Guyana Highlands, and Amazon Basin.

Explanation

Anthracite coal is known for its dense, shiny appearance and high carbon content. It contains 91% carbon, making it the type of coal with the highest percentage of carbon among the options provided. Additionally, anthracite has low volatility and burns with minimal smoke.

Explanation

Asteroids are rocky fragments of various sizes that orbit the sun. While most asteroids are small, some can be as large as 1000 km in diameter. These space rocks orbit between Jupiter and Saturn. The correct statements regarding asteroids are that they are rocky debris of varying size orbiting the sun and some have diameters as large as 1000 km.

Explanation

In this question, you were asked to match the special characteristics of planets with their respective names. The smallest planet in the solar system is Pluto, the largest planet is Jupiter, the planet second from the Sun is Venus, and the planet nearest to the Sun is Mercury. The correct matching of these characteristics with the planets is as follows: A-4; B-3; C-2; D-1, which means Pluto is the smallest, Jupiter is the largest, Venus is second from the Sun, and Mercury is the nearest to the Sun.

Explanation

Asteroids are a collection of small rocky fragments that orbit the sun between Mars and Jupiter. There are about 40,000 asteroids in this region.

Explanation

The Sun is the closest star to Earth among the options provided. It is situated at a distance of 150 million kilometers from our planet and has incredibly high temperatures exceeding 15 million degrees Celsius.