| The saving and wise use of natural resources is ____. |
asthenosphere |
| A mineral's ability to split easily along flat surfaces is ____. |
cleavage |
| The water on, under, and over Earth's the surface is its ____. |
conservation |
| The hardest naturally-occurring mineral on Earth is ____. |
crust |
| The rigid lithosphere floats atop the slowly flowing ____. |
diamond |
| The removal of sediments by wind or water is called ____. |
erosion |
| The ____ has igneous, metamorphic, and sedimentary rocks. |
hydrosphere |
| The Earth's ____ is composed of hot liquid iron and nickel. |
outer core |
