18. <em>Penny</em>: Used to measure mineral toughness; <em>Cuprum</em> penny's toughness is 3.
<em>Hand Lens</em>: Could be used to measure the hardness of the mineral; the glass can be used as a scratch platform; it can also be used to test the luster of the mineral tile; the mineral is rubbed in the glass portion of the tile and a powdery strike of the stone is given to distinguish the colour of the rock.
<em>Geological hammer</em>: Used to break down the mineral to assess whether or not it has cleavage, and to detect fractures
<em>Pocketknife</em>: Used to define mineral tenacity; the tenacity of the mineral can be silky, malleable, sectile, elastic, or flexible.
17. Volcanoes are holes or cracks in the lava-flowing crust of the earth. They are normally placed on the borders of tectonic plates as they are created as the plates clash and create gaps. In other words, volcanoes located at convergent-plate boundaries.
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Some adapt by limiting there outdoor activities to warmer parts of the day, they wear thicker clothing , stay in there houses and use fires to stay warm
<span>rainwater runoff into local streams </span>
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"The increase in cytoplasmic volume, as in cell development and cell reproduction. The increase in size or population of cells, as in mitosis. When used to describe the growth of cell populations, cell growth refers to the growth and division of the “mother cell” into two “daughter cells".
Explanation:
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