12-1
what is soil
what is a complex plant supporting system
what is salinization
build up of salt in upper soil horizions
how many years since we discovered agriculture
ten thousand
what does gm mean
genetically modified
how healthy is soil world wide
The more organic matter in a sample of soil, the healthier that soil is
what is bedrock
what is the contuous mass of solid rock
what is crop rotation
when people grow diffent things different parts of the year
what are bug killers called
pesticide
what other farm is mentionened in section 4
aquaculture
how is soil formed
it is formed by weathered rocks
what is the smallest soil type
what is clay
why do people do use crop rotation
to give nutrients back to the field
what is most commin in developing world
mal nutrition
wha farm requires the most feed
beef
how can we protect soil
by crop rotation and terracing
what is the biggest soil type
what is sand
what are shelter belting
plants that prevent erosion
what do bees do
polinate plants
what farm requires the least feed
dairy
is soil a renewable resouces
no
list the soil horizions in order bottom to top
r c b e a o
what country loses 6.5 billion a year
what is china
double jeopardy what does bt stand for
bacillus thuringiensis
why is gmo wheat called a mutant
because its in bread
what 3 elements make soil healthier
nitrogen phosphorous potassium