| Term 
 | Definition 
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        | Term 
 | Definition 
 
        | It is the solid part of the surface of the earth. |  | 
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        | Term 
 | Definition 
 
        | The earth is a planet, or world, that we inhabit. |  | 
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        | Term 
 
        | Is the part of the earth's surface which we can see large or small? |  | Definition 
 
        | It is large to us, but very small compared with the whole of the earth's surface. |  | 
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        | Term 
 
        | Does it appear to be round, like a ball, when we look at it? |  | Definition 
 
        | It does not; it seems to be flat. |  | 
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        | Term 
 
        | Why does it seem to be flat? |  | Definition 
 
        | A small part of the of any large ball appears flat when we can see no other part. |  | 
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