1. Which of the following is a limitation of a model of the Earth? (SC.6.N.3.4)
A.
A model cannot show every detail of objects on the Earth.
B.
A model cannot be used to make predictions about the Earth.
C.
A model cannot be used to study the Earth that is too large to see directly.
D.
0
A model cannot be used to explain new information that we collect about the Earth.

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Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].