There is no questions could you please do it again
The answer is c, because a compound is two substances combined chemically and a mixture is not
38: Is Primary Producers
39: Is 9,990
40: Is Fungus
41: Is A
42: Is A
The correct answer is option D.
If a girl is standing in front of a smooth surface from which a sound is reflected, the girl may hear two similar sets of sounds if she is also near the source of the sound.
For proper reflection of all sorts of energy waves, a hard flat surface is preferable. This helps to reflect waves without losing energy. Hard and smooth surfaces are best for travelling of sound waves because sound is related to pressure.
Answer:
Mars has mountains, valleys, and volcanoes, but the red planet's are by far the biggest and most dramatic.Recent and continuing missions to Mars are showing that the Red Planet may be more geologically active than previously thought.Olympus Mons, the solar system's largest volcano, towers some 16 miles above the Martian surface, making it three times taller than Everest.Geologists think one of the reasons volcanoes on Mars were able to grow so large is that Mars has fewer tectonic boundaries in comparison to Earth.
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