People, Development and Environment - People, Development and Environment Section 1

Japan experiences the most frequent earthquakes in the world due to its location on the Pacific Ring of Fire, where several tectonic plates meet. The country is highly seismically active and has advanced earthquake monitoring and building technologies because of this risk.

• Option A: Italy
  Incorrect. Italy does experience earthquakes, but not as frequently as Japan.

• Option B: Japan
  Correct. Japan lies at the intersection of multiple tectonic plates and is part of the Pacific Ring of Fire, making it highly prone to earthquakes.

• Option C: China
  Incorrect. China has a history of deadly earthquakes, but they are less frequent than in Japan.

• Option D: Iran
  Incorrect. Iran is seismically active but not the most earthquake-prone country.

High velds are temperate grasslands found in the interior plateaus of South Africa. They lie at elevations between 1,200 to 1,800 meters and are characterized by rolling grasslands. These areas have a moderate climate and are important for agriculture and livestock farming.

• Option A: Africa
  Correct. High velds are located in the southern part of Africa, particularly in South Africa.

• Option B: South Australia
  Incorrect. Temperate grasslands in South Australia are not called high velds.

• Option C: Europe and Asia
  Incorrect. Temperate grasslands in this region are called steppes.

• Option D: South America
  Incorrect. The grasslands in South America are known as pampas, not high velds.

A light year is a unit of distance. It represents the distance that light travels in one year in a vacuum, which is approximately 9.46 trillion kilometers. It is commonly used to measure distances between stars and galaxies.

• Option A: Intensity of light
  Incorrect. Light intensity is measured in units like lumens or candela, not light years.

• Option B: Distance
  Correct. A light year measures how far light travels in a year.

• Option C: Time
  Incorrect. Although it includes the word "year," it is not a unit of time.

• Option D: Planetary motion
  Incorrect. Planetary motion is usually described in terms of orbital period, velocity, or distance, but not

All vital atmospheric processes such as cloud formation, rainfall, storms, and temperature changes take place in the troposphere. This is the lowest layer of the atmosphere, extending up to about 8 to 15 kilometers from the Earth's surface. It contains most of the atmospheric water vapor and is directly influenced by the Earth's surface.

• Option A: Troposphere
  Correct. It is the most active part of the atmosphere in terms of weather and climate.

• Option B: Ionosphere
  Incorrect. The ionosphere is a part of the thermosphere and is important for radio communication, not weather.

• Option C: Exosphere
  Incorrect. This is the outermost layer of the atmosphere where atmospheric particles are very sparse and weather processes do not occur.

• Option D: Stratosphere
  Incorrect. This layer lies above the troposphere and contains the ozone layer but does not support most weather activities.