When the air is clear, the sunset will appear yellow, because the light from the sun has passed a long distance through air and the blue light has been scattered away. If the air is polluted with small particles, natural or otherwise, the sunset will be more red. Sunsets over the sea may also be orange, due to salt particles in the air. The sky around the sun is seen reddened, as well as the light coming directly from the sun. This is because all light is scattered relatively well through small angles, but blue light is then more likely to be scattered twice over the greater distances, leaving the yellow, red and orange colors.
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Feb 17, 18 05:06 AM
Printable and online grammar exercises-- How Much vs How Many worksheets with answers
Feb 17, 18 04:29 AM
Unless means except if. We use unless to make an exception to something we say. See details with examples and exercises.
Feb 16, 18 07:50 AM
Second conditional (type two) grammar exercise with answers -- Check your answers at the bottom of the worksheet.
Feb 14, 18 09:57 AM
If conditional type 1 (first conditional) grammar exercise with answers-- Check your answers at the bottom of the worksheet.
Feb 14, 18 03:36 AM
Uses of In Case, detailed rules explanations with examples and exercises for English learners and teachers
Feb 14, 18 03:32 AM
Uses of Wish Clauses, grammar rules with examples, exercises, and detailed explanations.
Feb 14, 18 03:26 AM
IF clauses / First, Second and Third Conditionals (Type 1, type 2, type 3) categories explained with details, examples and exercises
Feb 14, 18 03:22 AM
Third conditional if is used for unreal situations in the past. Type three conditional grammar, with examples and exercises
Feb 14, 18 03:21 AM
Second conditional IF also referred as Type 2 conditional is used for...See second conditional rules, examples and exercises
Feb 14, 18 03:19 AM
First conditional if (Type one conditional) is when the condition is in present or future... see details with examples and exercises