soil horizons
what is the name of the thinnest layer of soil?
organic material or humis
this soil particle is about 1 millimeter in size
sand
the washing or blowing away of the top layer of soil is called...
soil erosion
too much salt goes into the soil from the water. It causes soil erosion and damages the roots of plants.
how many layers of soil are there?
five
which layer is made of clay, iron and organic matter?
subsoil
this is the medium size particle of soil, its about 0.05 millimeter in size
silt
what can humans do to help prevent soil erosion
plant tall grass and shrubs, build walls with drainage, be careful not to have too many animals in one area
a substance used to destroy pests, such as insects or weeds.
pesticides
what insect do we need for compost?
earthworms
this layer is made of mostly large rocks
parent material
this particle of soil is the smallest and the finest, its about 0.002 millimeters in size
clay
during soil erosion, the process when soil particles are picked offthe ground.
detachment
what is the definition of compost
a fertilizer that is made out of natural materials, like dead plants
eggshells can be put in compost
TRUE or FALSE
true
this layer is made of humus and minerals. plants and organisms like to live here, like moles and worms.
top soil
this soil particle is hard for water to pass through, mainly because it becomes sticky when wet
clay
during soil erosion, soil particles are moved by water or wind, this step is called...
transportation
BLANK is a any material added to soil to help plants grow
fertilizer
when a row of tress are planted, soil particles are....
NOT blown away
bedrock is made of...
soild rock
the best soil for gardeners to use is called..
loamy soil
during soil erosion, the lasts step when the soil particles are put in a new location
desposition
POSITIVE or NEGATIVE impact
Humans add compost t the soil as a fertilizer.
POSITIVE
loamy soil is made of.... X%, X% and X%
20% clay
40% silt
40% sand