Crag and Tail, term applied to a peculiar formation of hills in which one side forms a steep and precipitous cliff, while the other 'tails' away in a gentle slope. This is due to glacial action on rocks of varying hardness, the harder rocks (generally igneous, such as dolerite or basalt) having resisted denudation and so protecting the softer rocks on the lee side. The 'crag' … [Read more...] about What Is Crag And Tail;How Can We Recognize It
Questions And Answers
Yes it is difficult On land we are able to compare our rate of travelling with that of other moving objects, such as trains, motor cars, cycles, pedestrians, etc. Allowance must also be made for the rate at which the air is moving, e.g., if the air is moving at forty miles per hour, an aeroplane travelling against it at sixty miles per hour only appears to be doing twenty miles … [Read more...] about Why is it difficult for an airman to estimate his speed when travelling?
Rooks build their nests of thick twigs and place them in the tops of tall trees, Here they are free from molestation and can be used year after year, only needing to be repaired. … [Read more...] about Why can rooks use the same nests year’ after year ?
The “ corncrake ” or landrail has a habit of turning it head when uttering it familiar cry with the result that the sound appears to come from the opposite direction. … [Read more...] about Why Some birds Are called the ventriloquist Bird?
Mansonella ozzardi is found only in the New World, occurring in South America and certain foci in the Caribbean. The adult worms are embedded iii visceral adipose tissue. Although they are usually regarded as nonpathogenic, fever, headache, lymphadenitis, and erythematous irritant skin rashes have been reported in association with their presence. Cold extremities, the result of … [Read more...] about What Is Mansonella Ozzardi;What Does It Do?