Earth Changes
The purple milkweed butterfly, which winters in the south of the island, passes over some 600m of motorway to reach its breeding ground in the north.
Many of the 11,500 butterflies that attempt the journey each hour do not reach safety, experts say.
Protective nets and ultra-violet lights will also be used to aid the insects.
They applied the method to a marine sediment core taken in the outflow of the Congo River. This core contained eroded land material and microfossils from marine algae. The results show that the land environment of tropical Africa was cooled more than the adjacent Atlantic Ocean during the last ice-age. This large temperature difference between land and ocean surface resulted in drier conditions compared to the current situation, which favours the growth of a lush rainforest. These findings provide further insight in natural variations in climate and the possible consequences of a warming earth on precipitation in central Africa. The results will be published in this week's issue of 'Science'.
Writing in the journal Science on Thursday, a team led by Harald Furnes of the University of Bergen in Norway said these ancient layered rocks from southwestern Greenland originally were formed on the sea floor of primordial Earth.
They are made up of thin sheets of formerly molten rock, and look a bit like a multilayered cake. They contain a mix of volcanic rocks associated with the formation of new crust.
Plate tectonics is a theory broadly accepted by geologists relating to the movement of the gargantuan plates that make up the planet's surface. These plates, largely corresponding to the continents, are in constant gradual motion.
The Zululand coast took a considerable pounding yesterday as Mother Nature unleashed her fury twice.
Richards Bay's beachfront took a hammering early on Monday as huge waves, driven by gale-force winds, scoured the beach and came within metres of crashing into the municipal beach office.
The beachfront and beaches around the harbour waterfront suffered further damage during Monday afternoon's phenomenal tide, which came close to causing major flood damage to the TuziGazi Waterfront.
Lifeguards evacuated the two-storey building and removed all valuables yesterday morning because municipal officials feared that although the structure rested on deep piles, erosion could make it unstable.
Mudslides have buried whole villages, rivers have burst their banks and roads have been cut off since Cyclone Indlala struck on March 15.