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• a) A cloud of dust raised by powerful summer storms.
• b) Steam from the eruption of the geysers in Yellowstone National Park that lasted for weeks.
• c) A pollution cloud coming from factories in Pittsburgh and Chicago, which floated at 10 metres because of a depression.
• d) A massive swarm of locusts.

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• a) Turquoise.
• b) Violet.
• c) Ochre.
• d) Beige.

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• a) The Eurasian and North American tectonic plates moved more than a meter away from each other without causing an earthquake. The rift, which had filed with sea water, sealed itself nearly completely
• b) Because of a volcanic eruption, a hole more than a kilometre deep and three kilometres wide appeared in the middle of the Vattnajökull iceberg.
• c) The Laxdor fishing harbour’s 200 residents were steamed to death in a giant geyser eruption. The geyser was later named Helvete.
• d) The Laki volcano’s eruption killed a large number of the cattle and as a result about 10,000 Icelanders, or one-fifth of the island’s residents, died.

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• a) Through people’s shoes, clothes and luggage as well as on the feet of migrating birds and other animals.
• b) In oil shipments.
• c) In the cargo of ships.
• d) Through air currents.

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