The first priority of integrated waste management is
a. recycling materials
b. using biodegradable material
c. creating more durable products
d. reducing the amount of materials used
e. Both c and d
E
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Summer and winter constellations are different because
A) of the spin of the Earth about its polar axis. B) the night sky faces in opposite directions in summer and winter. C) of the tilt of the Earth's polar axis. D) the Earth is at the solar perigee in winter and apogee in summer. E) the universe is symmetric and harmonious.
Who is the discoverer of sea-floor spreading?
a. Alfred Wagener b. Harry Hess c. James Hutton d. Charles Darwin
What type of silicate minerals is shown from this arrangement of silicon tetrahedron?
A. double chains B. single chains C. frameworks D. sheets E. independent tetrahedra
Deep-focus earthquakes occur only at:
a. transform-fault plate boundaries b. divergent plate boundaries c. convergent plate boundaries d. all types of plate boundaries