Free Printable WorksheetScienceGrade 9Science CurriculumNGSS HS-PS1-8, HS-ESS1-5, HS-ESS1-6

9.97 Absolute Dating and Half Life Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Physical Science with Earth and Science Science worksheet provides structured practice on 9.97 Absolute Dating and Half Life. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Absolute Dating and Half-Life: MCQ focus: interpret radiometric data and half-life graphs to estimate ages of rocks, fossils, and Earth materials. Aligned to NGSS high school Physical Science, Earth and Space Science, and Engineering Design; NRC/DCI; SEP/CCC; CCSS math/literacy connections; selected CA NGSS, NYSSLS, Florida CPALMS, and Texas TEKS references NGSS HS-PS1-8, HS-ESS1-5, HS-ESS1-6 - NGSS-aligned Absolute Dating and Half-Life: NGSS: HS-PS1-8; HS-ESS1-5; HS-ESS1-6; NRC/DCI: PS1.C; ESS1.C; SEP/CCC: Using mathematics / Scale, proportion, quantity; Common: HSN-Q.A; State refs: CA/NYSSLS HS-PS1/HS-ESS1; FL SC.912.P.10 and SC.912.E.6; TX Earth Systems.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Physical Science with Earth and Science

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 9.97 Absolute Dating and Half Life skill assessments:

Problem 1Difficulty: Mastery

A fossil lies between a lower ash dated 120 ± 2 Ma and an upper ash dated 116 ± 3 Ma. Considering the uncertainties, which broad age range is best supported for the fossil?

AYounger than 113 Ma only.

BExactly 118 Ma with no range.

CAbout 113 Ma to 122 Ma.

DOlder than 122 Ma only.

Solution & Explanation:The lower ash could be as old as 122 Ma, and the upper ash could be as young as 113 Ma. The fossil's broad bracket is therefore about 113 to 122 Ma.

Problem 2Difficulty: Mastery

Two ash layers are dated with the same isotope. The lower ash has a parent-to-daughter ratio of 1:1, while the upper ash has a ratio of 1:3. The isotope half-life is 10 Ma. What should scientists notice?

AThe upper ash appears older than the lower ash, so the sequence or data need investigation.

BThe dates fit perfectly because upper layers should always be older.

CThe isotope cannot decay because both samples contain daughter product.

DBoth ash layers must be exactly 10 Ma old.

Solution & Explanation:A 1:1 ratio indicates one half-life, or 10 Ma. A 1:3 ratio indicates two half-lives, or 20 Ma. An upper layer appearing older than a lower layer conflicts with a simple undisturbed sequence.

Problem 3Difficulty: Mastery

A class wants a visual that helps estimate unknown ages from parent isotope data. Which display would best support the half-life skill?

AA map of oceans without rock or isotope information.

BA pie chart of favorite minerals in the class.

CA graph of percent parent isotope remaining versus time with half-life tick marks.

DA decorative photograph of a mountain with no data labels.

Solution & Explanation:A percent-parent-versus-time graph directly shows the decay relationship needed to estimate age from a measured isotope fraction.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Physical Science with Earth and Science Science students. It aligns with educational standard NGSS HS-PS1-8, HS-ESS1-5, HS-ESS1-6 (NGSS: HS-PS1-8; HS-ESS1-5; HS-ESS1-6; NRC/DCI: PS1.C; ESS1.C; SEP/CCC: Using mathematics / Scale, proportion, quantity; Common: HSN-Q.A; State refs: CA/NYSSLS HS-PS1/HS-ESS1; FL SC.912.P.10 and SC.912.E.6; TX Earth Systems.).