Geochemistry

What are the three most abundant gases in the atmosphere?

• Oxygen, carbon dioxide, nitrogen

• Carbon dioxide, oxygen, argon

• Nitrogen, oxygen, argon

• Argon, nitrogen, carbon dioxide

Which of the following are the rarest elements on the Earth?

• O, Si, Al, Mg

• Cr, Cu, Zn, Fe

• La, Ce, Sm, Pr, Nd (or the Rare Earth Elements)

• Au, Pt, Ir, Os

Atomic number is equal to the number of ___________.

• neutrons

• protons

• neutrons + protons

• neutrons + electrons

What is the wavelength of the visible light spectrum?

• 400 to 780 nm

• 0.1 to 10 nm

• 100 to 400 nm

• 780 nm to 1 mm

In terms of weight concentration, parts per million (ppm) is equal to ______________.

• μg/kg

• g/kg

• mg/kg

• ng/kg

In a volcano monitoring system, what gases are constantly being monitored to predict the possible occurrence of an eruption?

• carbon monoxide and methane fluxes

• carbon dioxide and methane fluxes

• carbon dioxide and carbon monoxide fluxes

• carbon dioxide and sulfur dioxide fluxes

What are the pathfinder elements in gold exploration?

• Fe, Mn, Co, Cr

• Ti, Cu, Zn, Cd, Fe, Mn

• Ag, Cu, Pb, Zn, As, Sb

• Al, Mg, Si, Na, K, P

According to the Water Quality Guidelines and Effluent Standards of DENR-EMB, what is the maximum tolerable concentration of mercury in Public Water Supply (Class AA and A)?

• 0.002 mg/L

• 0.001 mg/L

• 0.003 mg/L

• 0.004 mg/L

According to the Water Quality Guidelines and Effluent Standards of DENR-EMB, what should be the pH range of seawater in Marine Protected Areas?

• 6 - 9

• 5 - 6.5

• 7 - 8.5

• 8 - 9

Aside from Ca²⁺ and CO₃^2-, what are the metal cations for the following carbonate minerals: siderite, cerussite and dolomite?