1) what are some of the changes from agricultural practices from 100 years ago? are these changes good or bad?

Agricultural practices from 100 years ago have changed over time because of advanced technology and experiments with seeds. Farming in the 1900s widely done in rural areas, families own small farms, toiled with there own family members. Farms raised animals like cows, pigs, sheep, and chickens. In the 1900s, machines were beginning to come over the fields.

The changes are good compare to the 100 years back because farmers don't have to work in fields for long hours. Now agricultural fields are bigger to supply grains and vegetables in larger numbers. Machines have taken place in the majority of the fields along with the advanced hybrid seed to produce maximum vegetables and crops.

a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container.

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radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.