Carbon.
#14:
Brass is CZn. It is used for plumbing, light fixtures, rivets, screws and ships. The properties of brass vary with the proportion of copper and zinc.
#15:
Sustainability preserves the ability of future generations to thrive and meet their resource needs on a habitable Earth.
#16:
a. Reusing does not change the material itself, but recycling breaks down the material in a way so that it can be used differently.
b. Reusing: using an older sibling's clothing, using old grocery bags to wrap presents.
Recycling: card board and water bottles.
#17:
a. Renewable Resources: geothermal energy, windpower, animal fat, alcohol
b. Nonrenewable Resources: plastic, nuclear energy, gold, silver
#18:
a. reusing
b. recycling
c. reusing
#19:
The life cycle of a lightbulb would differ from the life cycle of a newspaper, because once a lightbulb has burnt out there is virtually no use for it anymore. However, newspaper can be shredded down for compost, used to wrap presents, used to lay down on a table to protect from art project, folded up to create art, or used for packing to protect the stuff inside.
#20:
A law enacted by the government can be broken or changed, while a scientific law is fact and cannot be broken.
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