For example, some types of
water pollution change the color of the water in a lake or stream, whereas other types are less visible, but both can be equally detrimental
to the health of humans and nonhuman animals.
For example, 2,000
years ago, when the Romans smelted silver,
lead was released into the environment and carried by the wind over long distances; this lead can still be detected in Scandinavian
lake sediments.
Relatively few of these new compounds have been thoroughly tested
for possible health or environmental effects.
Now I understand why my new baby cousin sometimes cry when i carry her
The capacity to learn, remember, and symbolize information, and to solve problems, exists at a simple level in young infants, who can perform cognitive tasks such as discriminating animate and inanimate beings or recognizing small numbers of objects
Abilities for physical movement change through childhood from the largely reflexive (unlearned,involuntary) movement patterns of the young infant to the highly skilled voluntary movements characteristic of later childhood and adolescence
Physical growth in stature and weight occurs over the 15-20 years following birth, as the individual changes from the average weight of 7 1/2 pounds and length of 20" at full-term birth to full adult size. As stature and weight increase, the individual's proportions also change, from the relatively large head and small torso and limbs of the neonate, to the adult's relatively small head and long torso and limbs.
Newborn infants do not seem to experience fear or have preferences for contact with any specific people.By about 8-10 months, they go through a fairly rapid change and become fearful of perceived threats; they also begin to prefer familiar people and show anxiety and distress when separated from them or approached by strangers
Dyslexia is a significant topic in child development as it affects approximately 5% of the population (in the western world). Essentially it is a disorder whereby children fail to attain the language skills of reading, writing and spelling commensurate with their intellectual abilities.
Finite means:
a form of a verb that can occur as the head of a sentence. In Sam wants to leave, wants is finite, leave is non-finite.
all other processes that depend on it will cease
Several factors combine to make the problem an urgent one
World population
demand for energy will also increase
coal, oil (petroleum), natural gas, uranium, and fuel
wood—is limited and insufficient to sustain rapid rates of development.
debate about the exact length
of time available before the effects of a worldwide shortage become apparent
shortage will
occur.
geothermal energy, hydroelectric power, peat, ocean thermal energy, solar energy, tidal
energy, wind power, and fuel wood.
replenish themselves naturally in a relatively short time and will therefore
always be available.
Renewable energy resources
indirectly responsible for many other renewable energy sources.
ocean currents and winds are results of the uneven distribution of solar radiation over the Earth's surface
winds in turn produce
waves whose energy can be utilized
windmills and wind power
ocean thermal energy,
solar heating of the upper layers of the ocean produces temperature gradients that can be harnessed to generate
electricity
Sun also powers the hydrologic cycle,
in which ocean water is evaporated, transported over the continents, and precipitated as rain or snow to form rivers
flow energy produces hydroelectric power.
energy locked in such renewable fuel sources as wood and peat is derived from the Sun by the process of photosynthesis.
renewable energy source is geothermal energy
arises through the leakage of heat from the Earth's interior to the surface
over the entire
surface of the Earth at a very low average rate, leakage is much higher in certain locations.
Yellowstone National Park
Iceland, Italy, and New Zealand.
possible to tap the heat and use it for human purposes.
Nonrenewable resources originate from two processes: (1) photosynthesis, which occurred many millions of years ago, followed
by the fossilization of the plant and animal life that resulted, and (2) the formation of the Earth itself.
fossil fuels—coal,
oil (petroleum), and natural gas;
produced the fuels for nuclear energy, such as uranium for fission and lighter elements for fusion
irreplaceable
fuels represent an energy capital that must be invested wisely.
A
cleaner-burning fuel than oil, natural gas seemed to be in abundant supply at the turn of the 21st century and, with the
greatly enlarged network of gas pipelines,
was rapidly growing in use.
nearly total dependence on fossil fuels and hydroelectricity ensures that efforts to solve energy problems
by switching to alternative sources will have to overcome a great deal of inertia, both economic and psychological.
sources
as solar power, wind power, and synthetic fuels suffer from the serious drawback that few major installations now exist.
handicapped by the engineering problems of converting
the energy to a form useful to human beings.
solar energy reaches the top of the atmosphere in amounts
10,000 times greater than all human production of energy, it reaches the Earth's surface at rates of only about 80 to 250
W/m2,
and considerably less on cloudy days.
arge-scale system based on solar-collector panels will be physically
huge, causing problems of maintenance and land use
Wind power, wave power, and ocean-thermal-generation sources suffer from
similar difficulties
Even though there are some difficulties with working towards the alternative fuels, it may prove to be more efficient for smaller things (heat and power to small communities or single buildings) in the long run
Green house gases stay can stay in the atmosphere for an amount of years ranging from decades to hundreds and thousands of years. No matter what we do, global warming is going to have some effect on Earth. Here are the 5 deadliest effects of global warming.
As the temperature of oceans rises, so will the probability of more frequent and stronger hurricanes
global warming will exacerbate the conditions and could lead to conflicts and war.
A third of reef-building corals worldwide are threatened with extinction due to climate change and water pollution, according to the first global assessment on the marine creature by 39 scientists.
Destructive fishing and the degradation
"When corals die off, so do the other plants and animals that depend on coral reefs for food and shelter, and this can lead to the collapse of entire ecosystems," he added.