# Earth Science

2. To make observations, an observer must always use
(1)experiments
(2)the senses
(3)proportion
(4)mathematical calculations
Is it (2)?

1. 👍
2. 👎
3. 👁
1. Right!

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2. 👎
👤
Ms. Sue
2. Thanks!

1. 👍
2. 👎
3. mathemathical caculations

1. 👍
2. 👎
4. experiments

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2. 👎
5. Their sense

1. 👍
2. 👎

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