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81) Which of the following is NOT a metamorphic rock?

A metamorphic rock is a result of a transformation of a pre-existing rock. Obsidian is a naturally occurring volcanic glass formed when felsic lava extruded from a volcano cools rapidly with minimal crystal growth.

82) What two elements do all silicate minerals contain?

The most abundant elements in the Earth's crust are oxygen (46.6%) and silicon (27.7%). Minerals which combine these two elements are called silicates.

83) What planet has the highest density?

Earth is the densest planet in our Solar System, with an average density of 5.51 grams per cubic centimeter.

84) The Earth's core is composed primarily of what substance?

The Earth's inner core is believed to be primarily a solid ball with a radius of about 1220 kilometers. It is composed of an iron-nickel alloy and some light elements.

85) Which of the following is NOT a fossil fuel?

Fossil fuels are hydrocarbons, primarily coal, fuel oil or natural gas, formed from the remains of dead plants and animals. Solar power is obtained by harnessing the energy of the sun's rays.

86) Which of the following is a pure compound?

A "pure" compound simply indicates that a substance includes two or more elements in a specific ratio, which never varies. The chemical structure of glucose is always C6H12O6.

87) What type of rock is formed by consolidation of molten magma?

Igneous rock is formed through the cooling and solidification of magma or lava.

88) What is the windiest planet in our solar system?

Neptune's weather is characterised by extremely dynamic storm systems, with winds reaching speeds of almost 1400 mph--nearly attaining supersonic flow.

89) What is meant by the porosity of a rock?

90) Which of the following does NOT contain ions?