Homework: Earth's Outer Layer You have been investigating the question What is the land like underneath Earth's surface? Use the map below to show your thinking about this question. Show where Earth's outer layer is made of hard, solid rock by shading those regions.

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent