GGRA03H3 Lecture 6: lecture 6

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rosemuskrat776

2 Nov 2010

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Sentences, double-spaced part a: 3/5 concepts to define. E. g. urban culture, political ecology, historical patterns. Incorporate readings and lecture materials into answers. Focus on paraphrased definition part b: 5/10 terms or examples to define and explain relevance. Local to global scaled resolutions to problems. Key concept in the study of human and urban geography since 1990s. Studies how pristine nature (trees, wildlife, water, soil, grasslands - geophysical locations) is transformed through social decisions and practices in cities. Relationship between social (political, economic, cultural, everyday) decisions and practices and changing natural landscapes. How decisions come together to create new natural spaces in the community socio-nature: intertwining of social and natural processes in the transformation of nature. Regarding the creation or building of the river - how it was regulated/located cyborg urbanization: human insertions into or creation of natural spaces in cities - "human made nature"

Related Questions

Theoretical question here on relativity and black holecollisions.

Suppose a very small black hole (A) is at rest and an observer iswithin its event horizon.
Now consider that a much larger black hole (B) is approachingsingularity A at a highly relativistic speed (hence very highlyrelativistic momentum), and the two singularities collide head-on(extreme precision).

Now, by Conservation of Relativistic Momentum, the twosingularities (whether they fuse together or not) should travel inthe direction of initial motion of the larger black hole (B)because it had much more momentum.

Q: Is it possible for the observer, initially suspended withinevent horizon of Black hole (A), to escape both black holes becausethe collision would cause the 2 singularities to recede away fromher at a very high relativistic speed?

That is to say, would this bizarre black hole collision allow anobserver to escape a black hole and violate the concept of theevent horizon? If so, since not even light can escape a black holefrom within the horizon, would this imply that the observer isreceding away from the two singularities at a relative speedgreater than c? What sort of physical implications would this have,what would happen to the local spacetime? What strange events mightoccur? If this event is not possible, please explain explicitly whynot. If the observer did not escape, what sort of strange thingsmight she see when being dragged by the receding 2singularities?

Tiny solid and liquid particles suspended in the atmosphere are called aerosols. Windblown dust, sea salts, volcanic ash, smoke from wildfires, and pollution from factories are all examples of aerosols. Depending upon their size, type, and location, aerosols can either cool the surface, or warm it. They can help clouds to form, or they can inhibit cloud formation. And if inhaled, some aerosols can be harmful to people's health.

These maps show average monthly aerosol amounts around the world based on observations from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite. Satellite measurements of aerosols, called aerosol optical thickness, are based on the fact that the particles change the way the atmosphere reflects and absorbs visible and infrared light. An optical thickness of less than 0.1 (palest yellow) indicates a crystal clear sky with maximum visibility, whereas a value of 1 (reddish brown) indicates very hazy conditions.

High aerosol amounts are linked to different process in different places and times of year. High aerosol amounts occur over South America from July through September. This pattern is due to land clearing and agricultural fires that are widespread across the Amazon Basin and Cerrado regions during the dry season. Aerosols have a similar seasonal pattern in Central America (March-May), central and southern Africa (June-September, and Southeast Asia (January-April).

In other cases, however, aerosol concentrations are not related to fires. For example, from May through August each year, aerosol amounts rise dramatically around the Arabian Peninsula and nearby oceans due to dust storms. Elevated aerosol amounts nestle at the foothills of the Himalaya Mountains in northern India in some months, and linger over eastern China for much of the year. These elevated aerosol amounts are due to human-produced air pollution.

What is the most likely source of the high concentration of particulates that appear off the coast of northwestern Africa?

What is the most likely source of the high concentrations of particulates over central Africa and central South America?

What is the most likely source of the high concentrations of particulates over eastern China?

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GGRA03H3 Lecture 6: lecture 6

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