Water changes its state through heating and cooling. When heated, it turns into steam (gas), and when cooled, it becomes ice (solid). These changes occur due to variations in temperature and energy.
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Food provides the essential nutrients and energy required for growth. It supports the development of cells, tissues, and organs, enabling organisms to grow, repair damage, and maintain overall health.
Different regions on Earth support diverse life forms because each region has unique climates, landscapes, and resources. These variations create habitats that are suitable for various plants, animals, and microorganisms to thrive.
Science helps us understand natural phenomena like weather patterns, the functioning of our bodies, how machines work, and the principles of cooking. It also explains how plants grow and how diseases are treated.
The primary goal of science is to explore, understand, and explain the natural world by observing, questioning, experimenting, and analyzing, leading to new knowledge and insights about the universe and our surroundings.
“The Wonderful World of Science” introduces students to the fascinating journey of exploring the natural world through curiosity and the scientific method. It emphasizes science as a way of thinking and problem-solving, connecting ideas, and understanding the environment. The chapter ...
The maximum limit of sound intensity in decibels above which a person cannot hear is 95 dB. This threshold represents the level at which sound becomes too faint for the human ear to detect.
Polarization is not produced by sound waves in air. Sound waves are longitudinal waves that do not exhibit polarization, which is a property of transverse waves.
If the same note is played on sitar and flute, the sound produced by them can be distinguished due to the difference in sound quality. Each instrument has a unique timbre or quality of sound caused by the overtones and ...
Women’s voices are thinner (shrill) compared to men’s voices primarily because the frequency is higher. Higher frequency results in a higher pitch, characteristic of women’s voices. This is due to women having shorter and thinner vocal cords that vibrate at ...