Once the network has worked out where on the map the birds are, the rest of the system applies some rules of thumb, such as the favourite migration weather of, say, geese and the soaring habits of, say, vultures, to transform those data into a three-dimensional picture of where birds should be expected.
"Migrations, weather, tectonic plates, ice floes, all of it," she says breathily.
This may suggest that, for thick weathering profiles, although the extent of weathering strongly differs between temperate and tropical climates, the migration of the weathering front into the bedrock occurs at a relatively uniform rate regardless of present-day climatic conditions.
But a book like "Migration," over 500 pages in length, suggests instead an exquisite self preserved at mounting cost, an "open" style shuttered against the punishing weather of being a modern person.
The silica occurs either as weakly cemented nodules or as hardpan and accumulates as a result of downward translocation (migration) when solubilized during weathering of the soil.
Surely, many things affect migration, like weather, commutes, job opportunities, and families.
It is also responsible for the translocation (migration) of dissolved products of chemical weathering down a hillslope sequence of related soil profiles (a toposequence).
International migration officials want a global climate accord under discussion to address the growing risk of migration because of extreme weather.
Saprolite production rates (the migration rate of the weathering front into the bedrock) are also similar to erosion rates so the thickness of the entire weathering profile is effectively in steady-state.
We're already seeing migration of large numbers of people around the world because of food scarcity, water insecurity and extreme weather, and this is set to become the new normal.
However, its spread to Western Europe in late 2005 could be explained by weather-induced migration of waterfowl after a freeze in Eastern Europe (6, 7 ).
