Two geography questions, two geography questions in detail?

1 Main distribution:

1. Pacific Rim Volcanic Belt: It is basically the same as the ** belt, from the west coast of South and North America, Alaska, and the Aleutian Islands, through Kamchatka, the Japanese Islands, the Philippine Islands, and New Zealand. There are more than 300 active volcanoes in this zone, accounting for nearly 80 active volcanoes in the world, including 100 on the west coast of South and Central America and the West Indies.

There are more than 90 islands in Alaska, the Aleutian Islands, Kamchatka and Japan. There are about 200 in the western and southwestern Pacific Oceans, including 90 in Indonesia, making it the country with the largest number of volcanoes in the world. For example, the volcanoes of Japan, the Philippines and Chile that erupted in 1991, and the volcanoes in the eastern part of China, all belong to this zone.

2. Mediterranean volcanic belt: There are dozens of active volcanoes, such as Vesuvius, Yutian volcano and Tengchong volcano in China.

3. Atlantic volcanic belt: There are about 22 volcanoes, many of which are located below the surface of the sea, and the active volcanoes that have outcrops in Iceland and Jamjanjan Island are the products of mid-ocean ridges.

4. East African Volcanic Belt: Distributed along the Great Rift Valley, it is where the "mid-ocean ridge" on land is located.

2 Volcanic eruptions, hurricanes, landslides, tsunamis, ** – the only sure characteristic of nature's killers is that they always come back again and again. Our only defense is to be more effective** and protective.

What can't be prevented, it's a natural phenomenon, and humans can reduce it without destroying the ecology.

Pacific Rim Volcanic Belt**.

Mediterranean Sea - Himalayan Volcanic Belt** The reason is that these places are located at the junction of tectonic plates, the crust is unstable, and there are many volcanoes**.

With the current level of human science and technology, we cannot prevent volcanic eruptions, but can only strengthen scientific research on volcanoes and establish a disaster monitoring and early warning system. In particular, the active volcano is monitored, the volcanic activity is observed with precision instruments, the precursors of volcanic eruptions are grasped in time, and the time of volcanic eruptions is strodied, and early warnings are issued in time to reduce the losses caused by volcanoes.

1 Plate junction. Pacific Rim Volcanic Belt, Mediterranean-Himalayan Volcanic Belt.

2. Pay attention to distinguishing the types of volcanoes, if it is an extinct volcano, you don't have to worry, if it is a dormant volcano and an active volcano, you need to pay attention to its volcanic eruption law, and put an end to the construction of living or production near such volcanoes.

1 is distributed at the junction of plates.

2. Early warning before volcanic eruption, timely transfer of personnel and goods.

The junction of plates with plates.

1 Plate junction. Pacific Rim Volcanic Belt, Mediterranean-Himalayan Volcanic Belt.

2) Strengthen the establishment and improvement of early warning mechanisms, and implement the relocation and relocation of people in the volcanic areas as soon as possible.

Pacific Rim Volcanic Belt, Mediterranean-Himalayan Volcanic Belt.

Volcanic eruptions have not only disadvantages, but also advantages.

Mountain activities have also brought some wealth to mankind. Magmatic activity can form a variety of minerals; There are many mineral springs and hot springs in areas of volcanic activity, and often form scenic tourist resorts, such as Wudalianchi in Heilongjiang Province and Tianchi in Changbai Mountain in Jilin Province. Volcanic ash is rich in nitrogen, phosphorus, potassium and other elements, forming a very fertile soil, and the inhabitants of Cuba, Indonesia and other countries grew crops on the soil formed by ancient volcanoes and lava.

There are 4 major volcanic belts in the world: the Pacific Rim Volcanic Belt. There are more than 400 active volcanoes, including Cotopaxi (5,890 m) in Ecuador (5,890 m) is the world's highest active volcano, and Aconcagua (6,940 m) in the Argentine Andes is the world's highest extinct volcano; Mediterranean volcanic belt.

It stretches from the Iberian Peninsula in the west to the Himalayas in the east and connects with the Pacific Rim Volcanic Belt. The Atlantic Ridge Volcanic Belt. From Greenland in the north, through Iceland and the Azores to St. Helena, there are nearly 60 active volcanoes; East Africa's volcanic belt. It is distributed along the Great Fault Zone of East Africa, such as the famous Kilimanjaro volcano (5,895 m).

There are about 660 volcanoes in China, most of which are extinct volcanoes, mainly distributed in three zones: the Mongolian Plateau Belt. The largest number of volcanoes, such as Datong and Wudalianchi volcanic groups; Tibetan Plateau belt.

Such as the Tengchong volcanic group in Yunnan; Pacific Rim Belt. Such as Changbai Mountain and Taiwan's Datun volcanic group.

Remote sensing technology can analyze the scope of the affected area, provide data parameters for follow-up rescue, and avoid the recurrence of human and property losses, which is a very effective information tool. It can be applied to the large-scale analysis with the ground, which can clearly compare the geographical situation before and after the disaster, and can provide accurate information to the personnel on the front line of disaster relief in a timely manner, so as to avoid being attacked by secondary disasters again, and do a good job in the transfer of personnel and property in time.

Hello! The geography teacher will answer your questions.

1.Option b The diagram is centered on the North Pole, and the direction of the Earth's rotation is counterclockwise. If the shaded part indicates night, then AOB is both a morning and dusk line and a meridian. OA is the morning line, and the time of the meridian is 6 o'clock.

The longitude difference between the meridian where the A is located and the meridian where the morning line is located is 45°, the local time difference is 3 hours, and the local time is 3 hours earlier than the local time of the OA meridian.

2.If the shaded part is July 6 and the non-shaded part is July 7, then OA and OB are the date line. The earth rotates in a counterclockwise direction, OA is the longitude at 0 o'clock local time, and OB is the longitude at 180°. Local time in A is 3 o'clock on July 7.