A cataract is an area of a river where the elevation of the streambed changes too quickly or has to many boulders meaning people couldn't use part of the river as transportation.
This was a good thing because the cataracts effectively served as barriers so they could control travel. This meant that the Pharos found it impossible to control the land south of the first cataract. This ending up becoming the southern border of Ancient Egypt.
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Answer:
In vector calculus, the curl is a vector operator that describes the infinitesimal rotation of a vector field in three-dimensional Euclidean space. At every point in the field, the curl of that point is represented by a vector. The attributes of this vector (length and direction) characterize the rotation at that point. The direction of the curl is the axis of rotation, as determined by the right-hand rule, and the magnitude of the curl is the magnitude of rotation. If the vector field represents the flow velocity of a moving fluid, then the curl is the circulation density of the fluid. A vector field whose curl is zero is called irrotational. The curl is a form of differentiation for vector fields. The corresponding form of the fundamental theorem of calculus is Stokes' theorem, which relates the surface integral of the curl of a vector field to the line integral of the vector field around the boundary curve.
The alternative terminology rotation or rotational and alternative notations rot F and ∇ × F are often used (the former especially in many European countries, the latter, using the del (or nabla) operator and the cross product, is more used in other countries) for curl F.
Unlike the gradient and divergence, curl does not generalize as simply to other dimensions; some generalizations are possible, but only in three dimensions is the geometrically defined curl of a vector field again a vector field. This is a phenomenon similar to the 3-dimensional cross product, and the connection is reflected in the notation ∇ × for the curl.
Explanation:
Answer:
A. because clasts fall out of the glacier in size progression
Explanation:
Glacial outwash deposits layered because clasts fall out of the glacier in size progression. Glaciofluvial sediments are stratified deposits of sand and gravel, glacialy derived, but deposited by streams flowing from the glacier
Danube River<span>, </span><span>German </span><span>Donau, </span><span>Slovak </span><span>Dunaj, </span><span>Hungarian </span>Duna,<span>Serbo-Croatian and Bulgarian </span><span>Dunav, </span><span>Romanian </span>Dunărea,<span>Ukrainian </span><span>Dunay </span><span>, river, the second longest in </span>Europe<span> after the </span>Volga<span>. It rises in the </span>Black Forest<span> mountains of western </span>Germany<span> and flows for some 1,770 miles (2,850 km) to its mouth on the </span>Black Sea<span>. Along its course it passes through 10 countries: Germany, </span>Austria<span>, </span>Slovakia<span>, </span>Hungary<span>, </span>Croatia<span>, </span>Serbia<span>, </span>Bulgaria<span>, </span>Romania<span>, </span>Moldova<span>, and </span><span>Ukraine</span>
Fertilizer to balance the high alkalinity of the soil.
