Social Studies, 18.10.2019 07:50 deadlydemon0500

Which of the following factors determines how harmful an introduced chemical will be on the environment?
a. type of chemical
b. concentration
c. weather conditions
d. all of the above

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Answer from: boss1373

D. All of the above.

The type of chemical, its concentration, and weather conditions where said chemical is introduced are factors that determine how harmful an introduced chemical will be in the environment.

Examples of chemicals that are harmful to our environment are:
1) organochlorines - compounds like polychlorinated biphenyl (PCBs) originally developed for use in electrical equipments as cooling agents. They are carcinogenic and capable of damaging the liver, nervous system, and the reproductive system in adults.
2) dioxins - by-product of the manufacturing, moulding, or burning off of organic chemicals and plastics that contain chlorine. An environmental and health hazard.
3) cadmium - used in batteries, plastics, pigments and metal coatings. Produced by mining and other industrial activities. Accumulation will lead to kidney and bone diseases.

Answer from: Quest

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; ) b.t.w. what are three ratios equivalent to 5 : 11? thx

Answer from: Quest

clearcutting reproduces a new even-aged stand by completely removing the mature stand.

clearcutting as a silvicultural treatment has several characteristics:

it causes a sudden environmental change

it removes the seed source from the regeneration area

the configuration of the clearcut may affect seed dispersal

it begins a new rotation

it will eliminate some pests that require forest cover

overall, it temporarily removes the forest cover, transforming the forest community and environment.

clearcutting followed by artificial (seeded or planted) regeneration has several advantages:

we can avoid delay in restocking the site

we can introduce a selected species, seed source, and genotype

we can control arrangement and spacing

we can achieve uniformity in the new stand

we can overcome the problems associated with securing sufficient natural regeneration.

the shelterwood method involves the removal of most of the mature stand at the end of the rotation, but a portion of the mature stand is left standing. the shelterwood method serves three basic purposes:

to prepare the stand for production of abundant seed

to modify the environment in a way that promotes germination and survival of the selected species

to build up the amount and size of advance regeneration to ensure the prompt restocking of the new stand following overstory removal.

the shelterwood method involves a sequence of 3 cuttings:

preparatory cuttings: make the seed trees more vigorous and set the stage for regeneration. see our thinning page for more information.

establishment/seed cuttings: open up enough vacant growing space to allow establishment of the new regeneration.

removal cuttings: uncover the new crop to allow it to fill the growing space.

the residual trees in the shelterwood must:

be sturdy and windfirm

be able to survive exposure

flower and reproduce seed

be the best trees of the mature stand

keep in mind that the shelter trees must not occupy the entire site. a void must be created in order to make room for the new regeneration. the amount of shelter to leave will depend on the following factors:

species characteristics (seeding and shelter requirements)

the number of cuttings in the cutting sequence (1, 2, or 3)

landowner objectives

the size of the area to be regenerated

the final removal harvest level required to be profitable

the shelter must be removed before it impedes the growth of the new stand or threatens its survival.

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