What do lakes marked with diagonal lines mean?
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See http://www.edrnet.com/reports/topomapsymbols.pdf or http://rockyweb.cr.usgs.gov/nmpstds/acrodocs/qmaps/5psym202.pdf for symbols used in topographic maps.
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It is not a ocean or sea, which are salted.\n\nA lake is non salted water, but the word fresh might be miss leading. Lake Superior's "fresh" water that is not so fresh, but not salted.
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physical features are stuff like mountains, lakes, deserts, islands, etc.
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A hydrograph shows the flow in a stream over time.  The shape might be described as "peak and trough" line graph.  Here's a quick website to look at for an example of a hydrograph:\n\nhttp://mrbdc.mnsu.edu/major/midminn/subshed/sevenmi/vtour/hydrograph.html
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Lakes Huron, Ontario, Michigan, Erie, and Superior
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It simply means "marked".
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a few counties from me is Lake Dexter, one of the largest man- made lakes in Wisconsin. It wasn't the largest when they built it, but it grew on its own and now you can't even see from one side to the other! i don't know if there's an exact size or anything because it's still growing. i'm sure if you look it up on-line, you'll find out more. all i know is that it's great for fishing, swimming, boating, and ice fishing.
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The diagonal rule is a method for determining the order in which electrons fill sublevels of energy levels of atoms when doing electron configurations.
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Deltas and Estuaries are created at the mouths of rivers.\nAnother landform that is created close to the mouth of a river is an ox bow lake.
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To answer this question, you need to know the shape that these points make.  Are they on a line? or are they some two-dimensional shape?
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The principal diagonal is the most useful diagonal in the study of matrix algebra because it is related to several invariants. \nIf M and N are two matrices of the same linear transformation with respect to different bases, then their trace (the sum of the entries on the principal diagonal) is the same.\nA transformation that can be represented as a scaling of n independent vectors in an n-dimensional space has a diagonal representation in that space under a suitable change of bases (namely to those vectors it scales, called eigenvectors). The product of the entries of the diagonal in that representation is another invariant, called the determinant (it is the signed volume of a parallelepiped made up of the basis vectors after the transformation). The determinant is another important invariant that you will see all over the place in differential geometry.\nThe other diagonals do have names (the superdiagonal is on top of the principal, subdiagonal is on the bottom of the principal, etc.) but they are so rarely important that they have fallen out of fashion. See the source for more details.
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A straight line of traffic cones is a pattern.  \n\nA curved line is also a pattern.  A diagonal line that gradually closes off a line forcing cars to merge is also a pattern.
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it's maps that represents topography (details of the landscape) of a place: horizontal(plane) projection of objects located on it and contour (curves of elevation). details represented can differ,accordingly to the purpose of the map: engineering, cadastre, navigation, tourism, agronomy, landmanagement,defense....
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The International Date Line is an imaginary north-south line (at the 180th meridian) in the Pacific Ocean at which the date changes. The east side of the IDL is a calendar day earlier than the west side. The actual IDL used is not a straight line, but zigzags around certain populated areas.\n\nThe Equator is an imaginary line, running east to west, that is the origin for latitude. It is drawn exactly half way between the northern and southern hemispheres, where latitude measures 0 degrees.\n\nThe Prime Meridian is the imaginary line, running from north to south, that is used as the origin for measuring longitude. It is an imaginary line drawn through all locations where longitude is 0 degrees.
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Horizontal line beginning at (0, 4) (solid dot) and going left forever.  Diagonal line beginning at (0, 2) (open dot) angling down and to the right 45 degrees (-1 slope) going forever.
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I think it is something that placed in a way that from \nright to left (flat way) or so but not from up to down or down to up.\nexample: ------------------------- horizontal line
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http://eo.ucar.edu/basics/images/usgs_water_cycle.jpg