Earth/Space Physics Test 1 Review

Scope and Purpose:
- Covers all units discussed in Earth and Space Physics during the semester to prepare for Earth/Space Physics Test 1.
- Review instructions dictate answering every question to the best of one's ability.
- Review questions may be completed on a separate document or a separate sheet of paper.
Core Vocabulary List:
- Claim
- Evidence
- Reasoning
- Observation
- Question
- Hypothesis
- Experiment
- Conclusion
- Results
- Mass
- Metric system
- Accuracy
- Independent variable
- Dependent variable
- Periodic table
- SI units
- Scientific model

Sequential Order of the Scientific Method:
- $1$ . Observation
- $2$ . Question
- $3$ . Hypnosis
- $4$ . Experiment
- $5$ . Conclusion
- $6$ . Results
Importance of Measurement Units:
- Units (e.g., meters, inches, feet) are critical because they ensure clarity and accuracy in measurements.
- Example: Specifying a value as $6\,\text{ft}$ provides clear scale and context, preventing ambiguity.
Scientific Notation Conversions:
- Conversion from Scientific Notation to Standard Form:
  - Given expression: $3.5 \times 10^6$
  - Standard form equivalent: $3,500,000$
- Conversion from Standard Form to Scientific Notation:
  - Given number: $625,000$
  - Conversion steps: $6.25000 \rightarrow 6.25 \times 10^5$
  - Scientific notation equivalent: $6.25 \times 10^5$

Independent Variable:
- Definition: Represents the cause in an experiment; it acts alone and is directly manipulated.
- Example Scenario: Mariah wants to improve her math skills, so she studies $15\,\text{minutes}$ a day.
- Identified Independent Variable: Studying $15\,\text{minutes}$ a day.
Dependent Variable:
- Definition: Represents the effect in an experiment; its outcome depends directly on the independent variable.
- Example Scenario: After $3\,\text{months}$ , Mariah's math skills hot better.
- Identified Dependent Variable: Improvement in math skills.

CER Framework Overview:
- Claim: A conclusion or statement that directly answers a scientific question.
- Evidence: Scientific data and observations supporting the claim.
- Reasoning: Logical justification linking evidence to the claim through scientific principles.
Evaluation of Claim Statements:
- Option a: "Cats are cuter than dogs because I like them more." (Incorrect; subjective opinion).
- Option b: "Objects fall to the ground because of gravity." (Best scientific claim for CER).
- Option c: "Rainbows happen because they look magical." (Incorrect; non-scientific explanation).
- Option d: "Burgers are the best food for lunch." (Incorrect; subjective preference).

Classification of Earth's System:
- System Type: Closed system.
- Closed System Definition: Matter is trapped on Earth, while energy can freely flow in and out.
- Open System Comparison: Both energy and matter flow in and out.
- Isolated System Comparison: Earth would be completely separated from the rest of the universe by space.
Unique Features of Earth's System:
- Earth has lids.
- Earth contains a lot of liquid water.
- Earth possesses oxygen.
- Earth has a dynamic atmosphere.
System Interconnectedness:
- Observing different Earth systems simultaneously rather than individually allows scientists to understand interactions and feedback loops across interrelated boundaries, as energy flows through a closed matter system.

Mode Calculation:
- Trial Dataset (seeds sprouted in five trials): $8$ , $7$ , $9$ , $5$ , $7$ , $2$ .
- Definition: The number that appears most frequently in a dataset.
- Result: Mode = $7$
Mean Calculation:
- Given Dataset: $3$ , $4$ , $5$ , $9$ , $2$
- Calculation Steps:
  - $\text{Sum} = 3 + 4 + 5 + 9 + 2 = 23$
  - $\text{Count} = 5$
  - $\text{Mean} = \frac{23}{5} = 4.6$
- Result: $4.6$ (rounds up to $5$ )
Range Calculation:
- Given Dataset: $4$ , $2$ , $3$ , $6$ , $9$ , $8$ , $1$
- Calculation Steps:
  - $\text{Maximum Value} = 9$
  - $\text{Minimum Value} = 1$
  - $\text{Range} = 9 - 1 = 8$
- Result: Range = $8$

Measuring Table Length:
- Option A: Seconds
- Option B: Grams
- Option C: Kilometers
- Option D: Centimeters
- Best Selection: Option D (Centimeters)
Measuring Dog Mass:
- Option A: Centimeters
- Option B: Kilograms
- Option C: Meters
- Best Selection: Option B (Kilograms)

Slope Definition:
- The slope of a position vs. time graph represents an object's velocity.
Graph Meaning:
- A position vs. time graph displays where an object is located relative to time.

Claim: A conclusion or statement that directly answers a scientific question.
Evidence: Scientific data and observations supporting a claim.
Reasoning: Logical justification linking evidence to the claim through scientific principles.
Observation: The action of observing something or someone carefully to gain information.
Question: An inquiry to gain information or to clarify a situation.
Hypothesis: A proposed explanation for a phenomenon, to be tested through experimentation.
Experiment: A scientific procedure undertaken to test a hypothesis and observe the effects.
Conclusion: The final judgment or decision formed after an experiment based on the data collected.
Results: The outcome or findings of an experiment.
Mass: A measure of the amount of matter in an object, usually measured in grams or kilograms.
Metric system: A decimal system of measurement based on powers of ten, commonly used globally.
Accuracy: The degree to which a measured value reflects the true value.
Independent variable: The variable that is changed or controlled in a scientific experiment.
Dependent variable: The variable that is tested and measured in an experiment.
Periodic table: A tabular arrangement of the chemical elements, organized by their atomic number.
SI units: The International System of Units, a standardized system of measurement used in science and industry.