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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A moraine is a landform feature which is formed by the glacier retreating. The ridge of sediments that geologists found has a feature namely moraine.
<h3>What is moraine?</h3>
The materials usually soil or rocks left behind by the glaciers are called moraine.
Just like rivers that carries all sorts of debris and silt and eventually builds up to form deltas, similarly glaciers moves all sorts of dirt and boulders that assembles to form moraines.
As the geologist found a ridge of sediments and notices a glacier in the distance so this is the moraine.
Thus, the correct answer is C.
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A lit candle needs to draw oxygen from the air in order to continue burning. If you limit the amount of air available, the candle's flame eventually goes out once it uses up all the oxygen. Lit candles in smaller jar stop burning first because the oxygen trapped in the jar are fewer than the ones in bigger jars.
<span>Only a single amino acid could change, because the reading frame is unaffected</span>
