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

9.99 Geologic Time Scale 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 9.99 Geologic Time Scale. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Geologic Time Scale: MCQ focus: order major geologic time divisions and connect evidence to long time scales without memorizing excessive dates. 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-ESS1-5, HS-ESS1-6 - NGSS-aligned Geologic Time Scale: NGSS: HS-ESS1-5; HS-ESS1-6; NRC/DCI: ESS1.C; SEP/CCC: Scale / Stability and change; Common: RST.9-10.7; State refs: CA/NYSSLS same HS-ESS PE family; FL SC.912.E.6; TX Earth Systems 112.49.

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 9.99 Geologic Time Scale skill assessments:

Problem 1Difficulty: Mastery

A student wants to decide whether an event belongs in the Paleozoic, Mesozoic, or Cenozoic without memorizing many dates. Which strategy is best?

AUse the event's fossil and rock evidence to place it relative to known era boundaries.

BChoose the era whose name sounds most familiar.

CIgnore rock layers and use alphabetical order of era names.

DAssume every fossil event belongs to the Cenozoic.

Solution & Explanation:The skill emphasizes evidence-based placement. Fossils, rock layers, and dated boundaries can place events without requiring excessive date memorization.

Problem 2Difficulty: Mastery

Which explanation best connects geologic time order with evidence for long time scales?

AGeologic time is short enough to measure only with a stopwatch.

BRock relationships show sequence, while radiometric ages and planetary evidence show that the sequence spans millions to billions of years.

CRock relationships and dates are unnecessary because the order can be guessed.

DOnly the names of eras matter, not the evidence behind them.

Solution & Explanation:Geologists use relative relationships to order events and numerical or planetary evidence to understand the enormous time spans involved.

Problem 3Difficulty: Mastery

A sandstone rests on an eroded surface cut into much older limestone. What does that contact most likely represent in the geologic time scale?

AEvidence that sandstone is always older than limestone

BA gap in the local rock record called an unconformity

CA new eon that replaced all others

DProof that no time passed between the two rocks

Solution & Explanation:An eroded contact between older and younger rocks often represents missing time. Such gaps are important when interpreting local records.

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Frequently Asked Questions

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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-ESS1-5, HS-ESS1-6 (NGSS: HS-ESS1-5; HS-ESS1-6; NRC/DCI: ESS1.C; SEP/CCC: Scale / Stability and change; Common: RST.9-10.7; State refs: CA/NYSSLS same HS-ESS PE family; FL SC.912.E.6; TX Earth Systems 112.49.).