Environment (moderate)

Which of the following is an environmental problem associated with abandoned coal mines?

• Thermal pollution of streams in the area

• Acid drainage due to leaching of spoil heaps by rainwater

• Air pollution caused by smog from ozone formation

• Released nutrients that cause eutrophication into streams

The separation of the various components of crude oil in refineries is accomplished primarily by taking advantage of differences in which of the following?

• The densities of the components

• The solubility of the components

• The sulfur content of the components

• The boiling points of the components

Approximate efficiency of an average coal-fired power.

• 100%

• 95%

• 30%

• 15%

The most abundant element in Earth's crust.

• Oxygen

• Aluminum

• Iron

• Nitrogen

The most abundant element in Earth's atmosphere.

• Oxygen

• Aluminum

• Iron

• Nitrogen

Moh's scale is used to describe:

• The strength of wind

• The energy of earthquakes

• The proportion of dark-coloured minerals in a rock

• The hardness of minerals

Which one of these statements is true?

• You can run faster than a tsunami

• A tsunami wave height is large in the open ocean

• Tsunami can occur in lakes, rivers and oceans

• Tsunami travel at the speed of light

Mud, silt and sand are all________.

• Types of sediments

• Types of volcanic rocks

• Types of metamorphic rocks

• Fossil fuels

What kind of rocks are likely to form in shallow seas where lots of shells and corals live?

• Limestone

• Sandstone

• Black shales

• Marble

Scientists work out the absolute age of rocks by________.

• Counting the number of layers in them

• Measuring radioactive decay of certain elements (e.g. uranium) trapped in the rock

• Looking at what fossils they contain

• Measuring the temperature of the rocks