Answer:
On Days when High Particle Levels are Expected, Take these Extra Steps to Reduce Pollution:
Reduce the number of trips you take in your car.
Reduce or eliminate fireplace and wood stove use.
Avoid burning leaves, trash, and other materials.
Avoid using gas-powered lawn and garden equipment.
Answer:
C. Bordering European countries share close economic and cultural ties
Explanation:
Europe is one of the smallest continents, but it has the most countries per area of the continent. While there a re lot of different ethnic and linguistic groups, there are still similarity, especially regionally or with the neighboring nations.
Also, the majority of the countries have very close ties when it comes to economy and culture, and as mentioned this is easily noticeable when it comes to countries that are bordering.
Because there are cultural similarities, as well as economic ties, the people tend to known at least one more language apart from their native language, or in some cases the people tend to know multiple languages.
It also has to be taken in consideration that the English language is usually the international language in Europe, so more and more people across the continent speak it, and the learning of the language starts since early childhood.
A contour line (also isoline, isopleth, or isarithm) of a function of two variables is a curve along which the function has a constant value.[1] It is a cross-section of the three-dimensional graph of the function f(x, y) parallel to the x, y plane. In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level.[2] A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes.[3] The contour interval of a contour map is the difference in elevation between successive contour lines.[4]
More generally, a contour line for a function of two variables is a curve connecting points where the function has the same particular value. The gradient of the function is always perpendicular to the contour lines. When the lines are close together the magnitude of the gradient is large: the variation is steep. A level set is a generalization of a contour line for functions of any number of variables.
Contour lines are curved, straight or a mixture of both lines on a map describing the intersection of a real or hypothetical surface with one or more horizontal planes. The configuration of these contours allows map readers to infer relative gradient of a parameter and estimate that parameter at specific places. Contour lines may be either traced on a visible three-dimensional model of the surface, as when a photogrammetrist viewing a stereo-model plots elevation contours, or interpolated from estimated surface elevations, as when a computer program threads contours through a network of observation points of area centroids. In the latter case, the method ofinterpolation affects the reliability of individual isolines and their portrayal of slope, pits and peaks.<span>[5]</span>
