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Where does lead for a pencil come from?
Lead has never been used in pencils. The 'lead' in pencils is graphite, a form of carbon, mixed with clay.Modern pencils are the descendants of ancient writing instruments. In ancient Rome, scribes wrote on papyrus (an early form of paper) with a thin metal rod called a stylus, which left a light but readable mark. The ones made of lead worked best.When pieces of rock from a mineral deposit in England were found to be good for marking sheep, the people presumed it was a lead deposit. Then the pieces were made into the first pencils. Chemists said the deposit was actually graphite, a form of carbon, but 'lead pencils' were so popular that the name is still used to this day.
Where does sewers lead?
some goes in to the main sewerage system where it gets treated all water purified and the remainder of the waste gets buried inland or put out to sea.
How can volcanic eruptions lead to earthquakes?
Explosive eruptions can release energy along a fault line. A plus
Can tsunamis help the environment?
Tsunamis are large waves that can inundate coastlines with water over 10 feet high. They can pull large amount of beach sand from the coast and drag it into the shallows off the coast, disrupting shallow water ecosystems. The sand can also be pulled inland, coating the ground with several inches of sand that can choke the grass and other plants further from the water. It also tends to knock over trees and rip up shrubs that help hold the topsoil in place and reduce erosion - this can lead to problems after the storm with excessive soil degradation and run-off.
What are the sources of lead in the atmosphere?
Until relatively recently, lead was added to petrol to raise its octane rating. After decades of cars emitting this into our atmosphere, scientists began to find high levels of lead in the air of our cities and along major traffic arteries. Even after lead is no longer added to fuel, the lead remains in our urban environment and re-enters the atmosphere when disturbed.
Which country took the lead in European exploration along the west African coast?
The Portuguese was the European group that made voyages of discovery along West Africa.
A fatty deposit within an artery?
Plaque (which can lead to atherosclerosis).
When did Charles Sturt come to Australia?
Charles Sturt was sure there had to be an inland sea in Australia. Even though he solved the riddle of the westward-flowing rivers (which, unlike rivers on other continents, did not flow towards the coast), and found that the inland river system did not lead to an inland sea, this was something Sturt continued to search for. Fifteen years after his major expedition which traced the Murray River, Sturt still believed there had to be an inland sea, and travelled into the desert country of central Australia - but of course, he never found an inland sea.
How were the lives of aboriginal inhabitants of the northwest affected by the hudson bay company?
At first not very much. The business model was to have the Aboriginals bring furs to the coast to trade them for whatever the aboriginals wanted. THat worked well for many years and it allowed the Aboriginals to continue living as they always had but with the many benefits of European technology. The arrangement was very profitable for the HBC and that lead to Canadians from the east trading deep inland to cut off or intercept the furs before they could reach the coast. That lead to the HBC also trading further inland. Soon there were lots of traders far inland and behind them settlers and then competition for the land and eventually the Aboriginals became a minority in their own land and disenfranchised in some cases to the point of starvation.
What did the XYZ affair lead the Americans to do?
Following the XYZ Affair, there was a surge of nationalism from the Americans. This included calls of war - eventually contributing to the naval quasi-wars along the Atlantic coast.
Who explored the south pacific?
Balboa did
What did the third crusade lead to?
The Third Crusade lead to:The Treaty of Jaffa, which guaranteed safe passage of Christians and Muslims through Palestine and a 3 year truce between the armiesMost of the Levantine coast, from Tyre to Jaffa, returned to Crusader controlCrusaders recaptured Tiberias and some inland territories from the MuslimsThe capture of Cyprus and the establishment of Kingdom of Cyprus
What is zink's history in canada?
The zinc-lead-silver deposit was discovered in the year 1951.
Why is pencil lead known as lead if it is not really lead?
In ancient Rome, scribes wrote on papyrus (an early form of paper) with a thin metal rod called a stylus. The rod left a light but readable mark. Some early styluses were made of lead, and these were reasonably effective. When pieces of rock from a mineral deposit in England were found to be good for marking sheep, the people presumed it was a lead deposit. Then the pieces were made into the first pencils. Chemists said the deposit was actually graphite, a form of carbon, but 'lead pencils' were so popular that the name is still used to this day.
Why are ships unable to sail very far inland in coastal West Africa?
there are large waterfalls or steep rapids. These obstacles make it impossible for ship to sail the whole way between Africa's interior and the sea.ANSWER:because it is way too small
What information lead scientists that shallow seas covered much of the earth during the paleozoic era?
finding inland fossils of sea creatures in sedimentary rock. very far inland like idaho
How much does lead coast?
It costs 26 cents per ton.
