Precipitate is the now insoluble part formed when two chemicals react. Usually a solid, but if the fluid were dense, it may not settle. It could be a colloid. If you added NaCl solution to a AgNO3...
All comets (there are over 3,500 known) have different time-scales for their appearances. These depend on the length of their orbits - some comets have extremely large orbits which take them from...
The term 'appear' has numerous different senses: 1: seem to be true, probable, or apparent; 2: be issued or published; 3: appear as a character on stage or appear in a play, etc.; 4: present...