Animal manure, compost, and green manure are all types of ____________________ because they are derived from plant or animal materials.
Fill in the blank(s) with the appropriate word(s).
Right answer summary: organic fertilizers
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Explain how the changing climate influenced the formation of the Bering land bridge, and how this affected migration of humans and animals
What will be the ideal response?
This material ejected from an erupting volcano includes airborne particles of all size.
A. tephra B. lahar C. ash
In general, ________ has (have) the highest crude birth rates
A) Africa B) South America C) Europe D) North America E) China and India
Earth's magnetic field is attributed to the
A) flow of molten liquid in Earth's inner core. B) flow of molten fluid in Earth's outer core. C) movement of lithospheric plates in the outer mantle. D) movement of lithospheric plates at Earth's surface.