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Cash Crops and Food Crops What are the types of crops? Plants that farmers cultivate are called crops. A major part of the Indian economy is played by agriculture. It's the foundation of our nation. Over 70% of Indians depend on agriculture for both food and finances. It is the principal job in rural areas. The weather and soil conditions are the two key factors that affect crop cultivation. When used, crops can be divided into six categories: food, feed, fibre, Kharif, Rabi, and cash crops. Food crops, such fruits and vegetables, are grown for human use. Grain crops, including rice, wheat, and corn, are the most widely grown food crops worldwide. What are food crops? Fruits and vegetables are two examples of food crops that are harvested for human use. Grains like maize, wheat, and rice are the most widely grown food crops in the world. Food crops were the first to be obtained through agriculture. Food crops were the first to be obtained through agriculture. A result of agricultur

Ultrasonic waves and Infrasonic waves soundCBSE Class 8 Science What is Infrasonic sound? Infrasonic sound is defined as a sound with a frequency of less than 20 Hz. The frequency of infrasonic sounds is below the range of human hearing ability. Infrasonic sound waves can be produced by earthquakes, thunder, and volcanic eruptions, for example. Elephants and whales can detect this sound, even if the human ear is incapable of hearing it. Elephants, whales, rhinos, and pigeons all use infrasound to communicate. What are Waves of ultrasonic sound? Ultrasonic sound is defined as sounds with a frequency of more than 20,000 hertz (cycles per second). The frequency of ultrasonic noises is higher beyond the range of human hearing ability to discriminate. The hearing range of dogs, cats, bats, and mice, for example, extends into the ultrasonic frequency region. They are able to detect wavelengths that humans are unable to detect. Ultrasound's Applications Ultrasound is also used to monitor