Physical geography

Percentage of oxygen in air | oxygen at high altitudes | Oxygen vs Ozone

Percentage of oxygen in air

The percentage of oxygen in air is 20.95%. Nitrogen is the most prevalent gas and forms 78.08% of the atmosphere. Rest is other gases mainly Argon (0.9340%) and Carbon dioxide (0.0410%). Oxygen at high altitudes As we gain elevation, the percentage of oxygen in the air does not decrease. Rather the atmospheric pressure decreases, meaning …

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The four seasons on Earth | Why the Earth has seasons?

Seasons

Many people think Summers occur when the Earth is closer to the Sun. This is not true. In fact, when there are summers in the Northern Hemisphere, Southern Hemisphere experiences Winter and vice-versa. So what causes the seasons? Let’s read. The seasons on Earth (or any other planet) occur due to its axial tilt. Earth’s …

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Why is the South pole colder than the North pole?

Why is the South Pole colder than the North Pole?

The South Pole is colder than the North Pole. Why? let’s read. The geographic South Pole lies on the continent of Antarctica while the geographic North Pole lies on the Arctic Ocean. Antarctica is the continent with the highest average elevation (2,500 meters). As we know temperature drops with the increase in elevation, the South …

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Types of mountains

Fold mountains

There are 4 main types of mountains/mountain ranges classified on the basis of process of formation. Fold mountains Block mountains Volcanic mountains Residual mountains Types of mountains Fold mountains These are the most common types of mountains. Nearly all the famous mountain ranges e.g. the himalayas, the alps are fold mountains. Fold mountains form when …

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Types of rocks

Sandstone

There are different types of rocks that form the Earth’s crust. On the basis of origin, these rocks can be classified as Igneous rocks Sedimentary rocks Metamorphic rocks Types of rocks Igneous rocks Cooling and solidification of magma (molten material inside the Earth) forms the igneous rocks. Igneous rocks have a crystalline structure and a …

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