12.23.1

Sluicing separates metallic resources based on

• solubility.

• melting point.

• specific gravity.

• hydrophobic properties.

Where is the most likely location for gold-bearing quartz reefs?

• a sedimentary sequence with an organic-rich source rock

• fractures and joints surrounding a massive granite body

• joint planes in an exhalative massive sulphide complex

• an alluvial deposit in an igneous granite complex

The operational time of a mineral sands quarry is limited because mineral sands

• are replenished within a human lifespan.

• have a greater deposition rate than extraction rate.

• are formed from source rock through slow geological processes.

• are formed from the decomposition of plants and animals from millions of years ago.

Carbon sequestration is an example of which ecosystem service?

• cultural

• regulating

• supporting

• provisioning

A mature tropical cyclone formed off the west coast of Australia and was given a female name starting with J. A short time later, another tropical cyclone formed off the east coast of Australia. The correct name for this cyclone would be

• a female name beginning with K.

• a female name beginning with J.

• a male name beginning with K.

• a male name beginning with J.

Urbanisation can increase the magnitude of floods by reducing

• above-ground water storage capacity.

• impermeable surface area.

• evapotranspiration.

• run-off.

Determine when a PM2.5 concentration of 50 µg/m³ could be recorded.

• winter: 60% relative humidity

• winter: 90% relative humidity

• summer: 60% relative humidity

• summer: 90% relative humidity

Which inference is supported by the graphs?

• The ideal humidity level to reduce particulate matter is 80%.

• Humidity has the most impact on particulate matter during summer.

• Increased humidity results in a decrease in particulate matter concentration.

• Higher concentrations of particulate matter are more resistant to changes in humidity.

A geological map of India is shown. A viable location to explore for coal is

• 1

• 2

• 3

• 4

The most likely reason for the difference between Antarctic and Arctic extent changes since 1980 is

• significant glacial melting.

• decreasing salinity of the Arctic Ocean.

• the presence of a continental crust beneath Antarctica.

• a greater increase in northern hemisphere atmospheric temperatures.