Geography for Grade 7, Geography for Grade 7

El Niño, also known as El Niño Current, is a climate phenomenon caused by the eastward movement of the Walker Circulation Circle after the interaction between the ocean and the atmosphere over a large area of the Pacific Equatorial Belt. Normally, the monsoon currents in the tropical Pacific region move from the Americas to Asia, keeping the Pacific surface warm and bringing tropical rainfall around Indonesia. But this pattern is disrupted every 2 to 7 years, reversing the direction of winds and ocean currents, and the heat flow from the surface of the Pacific Ocean turns eastward towards the Americas, taking with it tropical rainfall and creating the so-called "El Niño".

La Niña refers to the persistence of abnormally cold sea surface temperatures in the eastern and central equatorial Pacific Ocean (as opposed to El Niño). is a new term used in meteorological and oceanographic circles. Meaning "little girl", it is the opposite of El Niño, which means "Holy Child", also known as "anti-El Niño" or "cold event".

1.The Peruvian cold snap usually flows northwest along the Peruvian coast. Plankton is abundant in the cold surface waters, which are good bait for fish.

But in recent years, warm waters have moved south from the equator every few years, forcing the Peruvian cold snap westward. Since this phenomenon usually occurs around Christmas, the birth of the Son Jesus, this warm ocean current is known as El Niño, which means "Son" in Spanish.

The warm waters have "killed" the plankton on which fish depend, severely damaging Peruvian fisheries. El Niño also causes drastic changes in the weather. In general, the annual precipitation off the coast of Peru is 25 1235 mm.

When El Niño arrives, annual precipitation can reach up to 360 mm in some areas, leading to flooding. El Niño is wide-ranging and devastating, and it can cause severe droughts in Australia, India, Africa and other places. According to statistics, the El Niño event of 1982 and 1983 caused losses of $20 billion worldwide.

At present, scientists have proposed a variety of models to explain, monitor and predict the occurrence of El Niño.

2.La Niña, which means "la ni a" in Spanish (note that it is not la nina) – little girl, holy woman, is the inverse of El Niño, a phenomenon in which water temperatures in the eastern Pacific Ocean near the equator drop abnormally, manifested by a marked cooling of the eastern Pacific Ocean, accompanied by global climate chaos, which always follows El Niño.

Meteorologists and oceanographers specifically refer to a phenomenon that occurs over a large and sustained period of anomalous cooling in the eastern and central equatorial Pacific Oceans (sea surface temperatures are below or above the climatic average for more than six months). La Niña is also known as the anti-El Niño.

El Niño and La Niña are anomalous manifestations of alternating cold and warm SST in the central and eastern equatorial Pacific Oceans, and this process of cold and warm SST formation constitutes a cycle, and it is not uncommon for La Niña to occur after El Niño. Similarly, La Niña will be followed by El Niño. But records since 1950 show that El Niño occurs more frequently than La Niña.

La Niña tends to be slower in frequency and weaker in the context of global warming. Especially in the 90s, there were three consecutive El Niños from 1991 to 1995, but there were no La Niñas in between.

Generally, La Niña occurs with El Niño, and the second year of El Niño occurs, La Niña occurs, and sometimes La Niña lasts for two or three years. Strong La Niña events occurred in 1988, 1989, 1998 and 2001, resulting in warmer than normal temperatures from the eastern to central Pacific Ocean, and weaker La Niñas in 1995 and 1996. Some scientists believe that La Niña has a tendency to weaken due to the trend of global warming.

1。The accident site is located in the southern hemisphere of the northern and southern hemispheres, and the eastern and western hemispheres of the eastern and western hemispheres, located in the direction of Beijing (40°N, 120°E)--southwest. 2。

Reading a globe or a political map of the world, the place of the accident is located in the indo-in-ocean ocean, and when a rescue signal is received, the nearest country immediately sends a plane to the country, which is the --- of Australia

Beijing: east longitude, north latitude.

Moscow: east longitude, north latitude.

Cairo: east longitude, north latitude.

Madrid: west longitude, north latitude.

Tokyo: east longitude, north latitude.

Washington: West longitude, north latitude.

London: 0, north latitude.

Canberra (UM 76°W 45°N Ottawa.

32°E 30°N Cairo.

18°E 32°S Cape Town.

Lia Capital): East longitude, south latitude.

76°W 45°N Ottawa.

32°E 30°N Cairo.

18°E 32°S Cape Town.

Please take a closer look at my answers, correcting some of your minor mistakes.

There is only one meridian and the one is ° (degrees). Only one of the parallels is the equator. The longitude is 30°, there are 2, and the longest parallel is the equator. The 0° latitude is also known as the equator. 165°E and 15°W warp form a warp coil.

There is only one meridian of 0 180 degrees). There is only one parallel, which is the equator at 30° longitude, and there are 2, and the longest parallels are the equator

The 0° parallel, also known as the equator, 165°E and 15W longitude form a coil of latitude and longitude.

What is the next volume of geography in the 7th grade?

Effects of the Earth's Rotation and Revolution Map of the Earth's Revolution Geography of the continents and oceans Types of climate in the world, such as tropical rainforest climate, temperate oceanic climate, etc. Characteristics of the distribution of the world's population World languages and the three major religions Geographical location of Asia, the dividing line with the continents Everything to remember in Japan India's Development and Climate Middle East Oil Export Routes West Europe.