<span>The difference between an element and a compound is that an element is a substance made of same type of atoms, whereas a compound is made of different elements in definite proportions. Examples of elements include iron, copper, hydrogen and oxygen. Examples of compounds include water (H2O) and salt (Sodium Chloride - NaCl) </span>
Answer:
Student 3
Explanation:
This question lets us know something about how the density of a gas varies with temperature.
When a gas is heated, its molecules spread out and expand. When this happens, the volume of the gas increases. Remember that density is defined as mass/volume. Thus as the volume increases, the density of the gas decreases.
Therefore, the carbon dioxide rose up because the heat expanded the gas and it became less dense.
The process described at locations U and X are Water changes from gas to liquid.
Answer: Option B.
<u>Explanation:</u>
Water cycle is a cyclical process when the water evaporates from the ground and then falls back on the ground in the form of rain or snow. The various stages of this process are water evaporating from lakes, ground, rivers and so on.
Then it goes up in the air, condenses. And from the condensation process, the clouds are formed. When they cool down up in the air, then the water falls back on the ground and precipitates from the cloud in the form of rain or in the form of snow.
Answer:
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Explanation:
Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes. Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat.
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