10 questions. Try each one, then open the answer to check yourself and read the explanation.
Which of the following processes is not involved in the formation of a delta?
Answer: B (Attrition)
A delta forms where a river slows at its mouth and drops (deposits) the sediment it has transported. Attrition, rocks wearing each other down, is erosion and not part of delta building.
The temperature of a place drops at a rate of 6.5°C per 1000m due to
Answer: D (adiabatic lapse rate)
Temperature falls with height because rising air expands and cools under lower pressure. Strictly, 6.5°C per 1000 m is the normal (environmental) lapse rate, but of these options the lapse rate is the answer.
Which of these is an intrusive igneous rock?
Answer: A (Gabbro)
Gabbro cools slowly deep underground, giving large crystals. Andesite, basalt and pumice cool quickly at the surface, so they are extrusive.
Laterite soils are most commonly found in:
Answer: D (humid tropical regions)
Heavy rain and heat in the humid tropics leach soils, leaving iron and aluminium oxides that form laterite.
Which of the following is not typically associated with subsistence agriculture?
Answer: C (High surplus for export)
Subsistence farmers grow mainly to feed their own families, so there is little or no surplus to export.
If it is 12 noon at Greenwich, what will be the local time at a place located at 75°E?
Answer: A (5:00pm)
Each degree is 4 minutes: 75 × 4 = 300 minutes = 5 hours. Places east are ahead, so 12 noon + 5 h = 5:00 pm.
Which of the following towns in Nigeria is a major center for tin mining?
Answer: A (Jos)
Tin (and columbite) is mined on the Jos Plateau. Enugu is known for coal and Port Harcourt for oil.
The largest archipelago in the world is
Answer: B (Indonesia)
Indonesia is made up of more than 17,000 islands, making it the world's largest archipelago.
Ocean currents that flow from the equator towards the poles are usually
Answer: C (Warm)
Currents moving away from the equator carry warm tropical water to cooler latitudes, so they are warm currents.
The thinning of the ozone layer is mainly caused by:
Answer: C (CFC emissions)
CFCs from old aerosols and refrigerators rise to the stratosphere, where they release chlorine that destroys ozone.