Question

Lizzie loves to stargaze at night. She has noticed that the moon appears to change shape over the course of the month, and she wants to investigate why this happens. She hypothesizes that the relationship of the sun, Earth, and moon creates shadows on the moon. She sets up an experiment with a lightbulb to represent the sun, a large beach ball to represent Earth, and a smaller foam ball to represent the moon. She researches the position of the sun, Earth, and moon at different times of a month and makes a model of the entire system.
Perform the following:

Identify the parts of the scientific method in Lizzie's experiment.
List at least three variables Lizzie should control during the experiment.
For each variable identified, give a specific suggestion for how Lizzie can control it.

Answer 1

Answer:

1. observation, investigation,hypothesis, experiment, result

2. lightbulb, beach ball and foam ball

3. she  can check the movement and position of the three variable with respect to each other

Explanation:

1. The different stages of the experiment depicted in this decription are

• observation - She observed the changing shape of moon
• Question - she questioned why this is happening
• investigation- She want to investigate the reason behind the changing shape of moon
• hypothesis - she establish a hypothesis that relationship of the sun, Earth, and moon creates shadows on the moon which causes different shapes of moon
• experiment- She conduct an experiment by creating a prototype of arrangement of sun , earth and moon in natural world
• result - she discuss the results.

Answer 2

Three variables can be used . 
1. Sun 2. Moon 3. Earth
These are suggestions that lizzie can control:
1. Discover how long the Earth takes to orbit the Sun
2. how many hours it takes the Earth to spin around once on its own axis, 3. how long the Moon takes to orbit the Earth