ScienceOcean LifeAges 11–13

Deep-Sea Life Without Sunlight

Contrast photosynthesis (energy from sunlight) with chemosynthesis (energy from oxidising chemicals like hydrogen sulphide); describe hydrothermal vent communities: chemoautotrophic bacteria form the base of a food web supporting tube worms, giant clams, and vent crabs with no sunlight; explore what deep-sea life tells us about the origin of life on Earth; explain why NASA studies ocean vents as analogues for potential life around hydrothermal activity on Europa and Enceladus

Lesson

Set out your lesson

Explain chemical-energy food webs without claiming alien life has been found.

Before teaching

Activity

Ask for an example of one prerequisite idea; revisit if needed. Historical graph coverage does not establish this learner’s readiness.

Printer, credit, and teaching notes

Instructions

Read supplied vent cards. No experiment with chemicals, heat or gases.

No Printer

Use supplied stage sheets on screen or scrap paper; keep adult keys separate.

Use the complete materials on screen or print only the current sheet. Keep adult guidance out of learner view. Retain an earlier model only when the current step supplies it as context.

Next: Show

Adult extras

Teaching limits and safe use

These are finite task opportunities, not proof of mastery. Record what was attempted and what support was used.

Canonical evidence array is empty; description and assessment receive partial opportunities only. Origin-of-life and extraterrestrial life remain hypotheses, not established results.

Use the fictional scenarios. Passing is allowed. Do not ask for private money amounts, account details, family conflict, identity or health information. Keep only minimal local learning notes.

Supplied data are explicitly practice data, not observations. Record only what is actually attempted; absent equipment, consent, partner or repeated observations means that part remains pending.

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Teaching approaches

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Explain chemical-energy food webs without claiming alien life has been found.

Family records and proof options

Keep a record of your learning

Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.

View learner plans ($12/mo per learner) See sample family archive

Learning resources

Extra practice links — they do not replace Gakuva’s teaching approach.

NASA Climate Kids · Practice link — not the full lesson

Ocean

Open practice(new tab)

Before you open · source notes

Ocean supports Deep-Sea Life Without Sunlight. An adult previews and guides; this is a learning page, not a scored quiz.

Free educational page, no sign-in required for the tested path.

Before you open

Ask the learner one fact they learned and one question they still have.

Opening this link does not save learning or assess mastery.

Source, access and review notes

Public NASA Climate Kids page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.

NASA Climate Kids. “Ocean.” External page; Gakuva does not copy, host, embed, or redistribute materials.

Unknown — link only

Check understanding

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“Can your child describe a community of animals living at the bottom of the ocean that gets its energy from volcanic chemicals rather than sunlight — and explain why scientists are excited about what this might mean for life on other planets?”

Curriculum record

Type: Conceptual
Subject: Science
Domain: Ocean Life
Age range: Ages 11–13

Curriculum