The horizon in which leached materials are accumulated is the ________ horizon
A) A B) O C) E D) B E) C
D
Environmental & Atmospheric Sciences
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In which of these diagnostic techniques is radiation from a radioisotope used?
A) CT B) MRI C) PET D) ultrasound
Environmental & Atmospheric Sciences
What is the main way by which ions are removed from soils?
A. Transport B. Organic activity C. Leaching
Environmental & Atmospheric Sciences
Eight natural elements compose 98.5% of the Earth's crust by weight. Which of the following is not one of those elements?
A) potassium B) nitrogen C) oxygen D) aluminum E) silicon.
Environmental & Atmospheric Sciences
In most developing countries, the largest proportion of energy is supplied through
A) coal. B) oil. C) wood. D) solar energy.
Environmental & Atmospheric Sciences