When did Ha Long Bay appear?

Hundreds of millions of years ago, the Ha Long Bay area was a humid swamp with giant cycad and fern forests accumulated over many generations.

Question

Question 1: How many bays does Vietnam have?

A - 48

B - 49

C - 50

Question 2: How many large bays are there in the East Sea?

A - 2

B - 3

C - 4

Question 3: The Gulf of Thailand is surrounded by how many countries?

A - 3

B - 4

C - 5

Question 4: When did Ha Long Bay appear?

A - About 500-410 million years ago

B - About 400-310 million years ago

C - About 300-210 million years ago

Ha Long Bay.

Question 5: Which bay in our country has about 2,000 islands?

A - Ha Long Bay

B - Cam Ranh Bay

C - Vung Ro Bay

Question 6: The world natural heritage Ha Long Bay is known as "a rock wonder standing in the sky". True or false?

A - False

B - Correct

Question 7: How many times has Ha Long Bay been recognized as a World Natural Heritage by UNESCO?

A - 2

B - 3

C - 4

Question 8: How many islands are recognized by UNESCO in Ha Long Bay?

A - 675

B - 775

C - 875

Answer

Question 1: Answer A - 48: In Vietnam, bays have an area of ​​less than 50km ² , coastal bays have an area of ​​50km ² or more. Statistics on a map at a scale of 1/100,000 show that along the coast of Vietnam there are a total of 48 bays with a total area of ​​about 4000km ² .

Question 2: Answer A - 2: The East Sea has two large bays, the Gulf of Tonkin and the Gulf of Thailand. These are two bays of important strategic position for the countries involved, including: Vietnam, China, Thailand, Malaysia and Cambodia. The Gulf of Tonkin is one of the largest bays in the world, with an area of ​​about 126,250 km2 (36,000 square nautical miles), the widest part is about 310 km (176 nautical miles), the narrowest part at the mouth of the bay is about 207.4 km (112 nautical miles). The Gulf of Thailand, also known as the Gulf of Siam, is a semi-enclosed sea, with an area of ​​about 320,000 km2, limited by the coasts of four countries: Thailand (1,560 km), Vietnam (230 km), Malaysia (150 km) and Cambodia (460 km). The northern tip of this bay is the Bangkok depression at the mouth of the Chao Phraya River. The boundary of the Gulf of Thailand is determined by the line connecting Ca Mau Cape of Vietnam to Kota Baru city of Malaysia. The length of the Gulf is about 830 km, the average width is 385 km.

Question 3: Answer B - 4 countries : The Gulf of Thailand (also known as the Gulf of Siam) is a semi-enclosed sea, with an area of ​​about 300,000 km2, limited by the coasts of four countries: Thailand (1,560 km), Vietnam (230 km), Malaysia (150 km) and Cambodia (460 km) .

Question 4: Answer A - About 500-410 million years ago. Ha Long Bay was a deep sea area during the Ordovician-Silvia period (about 500-410 million years ago); a shallow sea area during the Carboniferous-Permian period (about 340-250 million years ago); a coastal sea at the end of the Paleogene period and the beginning of the Neogene period (about 26-20 million years ago) and experienced several sea encroachments during the Anthropocene period (about 2 million years ago). During the Triassic period (240-195 million years ago), the Ha Long Bay area was a humid swamp with giant cycad and fern forests accumulated over many generations.

Question 5: Answer A - Ha Long Bay : According to the Government Electronic Information Portal, Ha Long Bay has the most islands in our country with about 2,000 large and small islands. Ha Long Bay is formed by thousands of large and small limestone islands, overlapping the emerald green water, creating a majestic and spectacular landscape like the quintessence of nature's arrangement for many centuries. The system of mysterious limestone caves and grottoes hidden deep under the stone pillars is covered with tropical vegetation, exuding a wild and mysterious beauty, along with the vestiges of the Earth's development history, attracting tourists from all over the world to come and admire and explore. With its unique and highly aesthetic natural landscape values, for the first time in 1994, Ha Long Bay was recognized by UNESCO as a World Natural Heritage. In 2000, Ha Long Bay was once again honored as a testament to the Earth's tectonic process over billions of years, creating unique geological and geomorphological values. The process of forming the natural landscape of Ha Long Bay is therefore also associated with the unique cultural and historical values.

Question 6: Answer B - Correct. The world natural heritage Ha Long Bay is known as "a rock wonder standing in the sky" or "the bay where dragons descend".

Question 7: The correct answer is B - 3. At 5:40 p.m. on September 16, 2023 local time (ie 9:40 p.m. on September 16, 2023 Vietnam time) in Riyadh, Saudi Arabia, the UNESCO World Heritage Committee officially recognized Ha Long Bay - Cat Ba Archipelago as a World Natural Heritage. This is the first time that two World Natural Heritages have been recognized as World Heritages in two provinces and cities of Vietnam. Previously, Ha Long Bay was recognized twice by UNESCO as a World Natural Heritage in 1994 and 2000.

Question 8: Answer B - 775. The world-recognized heritage area of ​​Ha Long Bay (core area) has an area of ​​434 km², like a triangle with three vertices: Dau Go Island (West), Ba Ham Lake (South) and Cong Tay Island (East), including 775 islands with many caves and beaches.