# Chapter 1. 162 Tour of the Planets

Map Learning Exercises

### Question Planetary Composition

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{"title":"Mercury","description":"You could land on Mercury. Are there other planets you could land on?","type":"correct","color":"#99cc00","code":"[{\"shape\":\"circle\",\"coords\":\"93,40,19\"}]"} {"title":"Venus","description":"You could land on Venus, but might not last very long! Are there other planets you could land on?","type":"correct","color":"#993300","code":"[{\"shape\":\"circle\",\"coords\":\"154,43,35\"}]"} {"title":"Mars","description":"You could land on Mars, and we've done quite a bit of that lately! Are there other planets you could land on?","type":"correct","color":"#000080","code":"[{\"shape\":\"circle\",\"coords\":\"323,42,22\"}]"} {"title":"wrong","description":"You could enter the atmosphere of this planet, but you couldn't land. It lacks a solid surface. Try again.","type":"incorrect","color":"#333333","code":"[{\"shape\":\"circle\",\"coords\":\"87,299,62\"},{\"shape\":\"circle\",\"coords\":\"265,293,54\"},{\"shape\":\"circle\",\"coords\":\"406,296,20\"},{\"shape\":\"circle\",\"coords\":\"462,295,23\"}]"}
Correct.

### Question Most Dense?

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{"title":"Mercury","description":"Mercury is pretty dense, leading us to believe that it must have a center of something VERY dense, like iron. But, it's not the densest. Try again.","type":"incorrect","color":"#99cc00","code":"[{\"shape\":\"circle\",\"coords\":\"93,40,19\"}]"} {"title":"Venus","description":"Venus is pretty dense, leading us to believe that it must have a center of something VERY dense, like iron. But, it's not the densest. Try again.","type":"incorrect","color":"#993300","code":"[{\"shape\":\"circle\",\"coords\":\"154,43,35\"}]"} {"title":"Earth","description":"Earth is the densest of the planets. The density of the entire Earth is greater than what we see when we analyze surface rock. This leads us to believe that it must have a center of something VERY dense, like iron. Other measurements support this idea, as well.","type":"correct","color":"#333300","code":"[{\"shape\":\"circle\",\"coords\":\"234,41,38\"}]"} {"title":"Mars","description":"Mars is pretty dense, leading us to believe that it must have a center of something VERY dense, like iron. But, it's not the densest. Try again.","type":"incorrect","color":"#000080","code":"[{\"shape\":\"circle\",\"coords\":\"323,42,22\"}]"} {"title":"Gas","description":"This planet is not very dense. It is primarily made of gases, like very thick clouds. Clouds aren't very dense compared to rocks. Try again.","type":"incorrect","color":"#333333","code":"[{\"shape\":\"circle\",\"coords\":\"87,299,62\"},{\"shape\":\"circle\",\"coords\":\"265,293,54\"},{\"shape\":\"circle\",\"coords\":\"406,296,20\"},{\"shape\":\"circle\",\"coords\":\"462,295,23\"}]"}
Correct.

### Question Rings, rings, rings...

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{"title":"No Rings","description":"This planet doesn't have any rings. Try again.","type":"incorrect","color":"#99cc00","code":"[{\"shape\":\"circle\",\"coords\":\"93,40,19\"},{\"shape\":\"circle\",\"coords\":\"154,43,35\"},{\"shape\":\"circle\",\"coords\":\"323,42,22\"},{\"shape\":\"circle\",\"coords\":\"234,41,38\"}]"} {"title":"Jupiter","description":"Jupiter has a few thin rings. Are there any other planets that have rings?","type":"correct","color":"#993300","code":"[{\"shape\":\"circle\",\"coords\":\"86,301,62\"}]"} {"title":"Uranus","description":"Uranus has a few thin rings. Are there any other planets that have rings?","type":"correct","color":"#000080","code":"[{\"shape\":\"circle\",\"coords\":\"406,296,20\"}]"} {"title":"Neptune","description":"Neptune has a few thin rings. Are there any other planets that have rings?","type":"correct","color":"#333333","code":"[{\"shape\":\"circle\",\"coords\":\"463,295,21\"}]"}
Correct.