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Lahars move rapidly down valleys like rivers of concrete. If you are on the floor of a valley that leads from a volcano and become aware of an oncoming lahar, seek high ground. Lahar is an Indonesian term that describes a hot or cold mixture of water and rock fragments that flows down the slopes of a volcano and typically enters a river valley.
They don't move quickly on land but are swift in the water. Walruses can swim on average around 4.35 mph (7 km/h) and as fast as 21.74 mph (35 km/h), according to the MarineBio Conservation Society.A group of walruses is called a herd. They gather by the hundreds to sunbathe on the ice. During mating season, walruses amass by the thousands.alruses can swim on average around 4.35 mph (7 km/h) and as fast as 21.74 mph (35 km/h), according to the MarineBio Conservation Society. A group of walruses is called a herd. They gather by the hundreds to sunbathe on the ice. During mating season, walruses amass by the thousands.