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Dust in homes is composed of about 20–50% dead skin cells. [2] The rest, and in offices and other built environments, is composed of small amounts of plant pollen, human hairs, animal fur, textile fibers, paper fibers, minerals from outdoor soil, burnt meteorite particles, and many other materials which may be found in the local environment. [3]
Putting these lines of thought together, we can say that although the tree falling on the island sends off air waves, it does not produce sound if no human is within the distance where the air waves are strong enough for a human to perceive them. However, if we define sound as the waves themselves, then sound would be produced.
The World Without Us is a 2007 non-fiction book about what would happen to the natural and built environment if humans suddenly disappeared, written by American journalist Alan Weisman and published by St. Martin's Thomas Dunne Books. [1] It is a book-length expansion of Weisman's own February 2005 Discover article "Earth Without People". [2]
The Earth’s trees absorb more than 7 billion metric tons of carbon dioxide — about a fifth of what the world lets out into its atmosphere — and release it back as oxygen or bind it into ...
Anne-Marie Bird links Pullman's concept of "Dust" to "a conventional metaphor for human physicality inspired by God's judgment on humanity." [1] Writing in Children's Literature in Education, she suggests that the first trilogy develops John Milton's metaphor of "dark materials" from Paradise Lost "into a ‘substance’ in which good and evil, and spirit and matter – conceptual opposites ...
Addition of supplementary visible light also increases components of dust bathing, and when hens are individually housed, the presence of a group of hens dust bathing in an adjoining pen with a dust bath increased dust bathing compared with the amount occurring when the hens were absent from the pen., [14] i.e. there is a strong influence of ...
Smog is a serious problem in many cities and continues to harm human health. [30] [31] Ground-level ozone, sulfur dioxide, nitrogen dioxide and carbon monoxide are especially harmful for senior citizens, children, and people with heart and lung conditions such as emphysema, bronchitis, and asthma. [14]
Humans are the main cause of the current mass extinction, called the Holocene extinction, driving extinctions to 100 to 1000 times the normal background rate. [ 120 ] [ 121 ] Though most experts agree that human beings have accelerated the rate of species extinction, some scholars have postulated without humans, the biodiversity of the Earth ...