The apparent strength of hydrocompactible soil is caused by:
a. tension exerted by water or clay bonds
b. compression exerted by water or clay bonds
c. electrostatic forces between adjacent particles
d. high density caused by the weight of the overlying soil
a
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The biosphere consists of the ________
A) sum of all the planet's living organisms and the abiotic portions of the environment with which they interact B) abiotic portions of the environment C) solid earth beneath our feet, plus the air we breathe D) saltwater and fresh water in surface bodies and the atmosphere E) air surrounding our planet, plus the water we drink
Pyrolysis is a way of producing ________ from ________
A) a liquid fuel; bioenergy B) hydroelectric fuel; coal C) pesticides and fertilizers; bioenergy D) biodiesel; limestone E) coal; bioenergy
Relative humidity is "relative" to pressure
Indicate whether the statement is true or false
Plasma cells are derived from which type of cells?
A) B cells B) helper T cells C) macrophages D) memory T cells