1. What is the charge of an atom with 20 protons and 18 electrons? 2. Water molecules are positive on one end, negative on the other. Predict what a negatively charged balloon will do when placed close to a stream of water.

the answer is "a.) well–developed vascular system."

explanation:

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this