Context: Recently, Yellowstone celebrated its  151st anniversary.

About Yellowstone national park :

• Yellowstone National Park is an American national park located in the western United States.

Salient features :

• Yellowstone National Park was the first national park in the US and is also widely held to be the first national park in the world.
• The park is known for its wildlife and its many geothermal features, especially the Old Faithful geyser, one of its most popular.
• The subalpine forest is the most abundant.
• It is part of the South-Central Rockies forests ecoregion.
• The rivers of the Snake-Columbia basin, Green-Colorado basin, and Missouri River Basin all begin as snow on the Continental Divide as it weaves across Yellowstone’s peaks and plateaus.
• Yellowstone Lake is one of the largest high-elevation lakes in North America and is centered over the Yellowstone Caldera, the largest supervolcanic on the continent.
• Caldera :

• A large bowl-shaped volcanic depressionis more than one kilometre in diameter and rimmed by in facing scarps.
• It is usually formed by the collapse of the top of a volcanic cone or group of cones because of the removal of the support formerly furnished by an underlying body of magma (molten rock).

Source: THE INDIAN EXPRESS

Previous Year Questions

Q.1) Consider the following pairs: ( 2020)

River                                    Flows into

1. Mekong –                   Andaman Sea
2. Thames –                     Irish Sea
3. Volga –                     Caspian Sea
4. Zambezi –                  Indian Ocean

Which of the statements given above is/are correct?

1. 1 and 2 only
2. 3 only
3. 3 and 4 only
4. 1,2 and 4 only

Q.2) Consider the following pairs: (2019)

Sea                   Bordering country

1. Adriatic Sea : Albania
2. Black Sea: Croatia
3. Caspian Sea: Kazakhstan
4. Mediterranean : Sea Morocco
5. Red Sea:  Syria

Which of the pairs given above are correctly matched?

1. 1, 2, and 4 only
2. 1, 3, and 4 only
3. 2 and 5 only
4. 1, 2, 3, 4 and 5