Challenge Crosswords Nature Expert — Set 3
🔬 Science Crossword #1
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Across
- 1. Center of an atom or cell
- 6. Substance providing immunity
- 9. Uncharged particle in nucleus
- 11. Mixture producing intense heat
- 12. Large molecule essential for life
Down
- 2. Wearing away of land by water or wind
- 3. Device for controlled nuclear reactions
- 4. Group of similar living organisms
- 5. Smallest discrete unit of energy
- 7. Positively charged particle
- 8. Naturally occurring inorganic solid
- 10. Diffusion of water through a membrane
Show answers
- 1 Across: Center of an atom or cell (7)NUCLEUS
- 6 Across: Substance providing immunity (7)VACCINE
- 9 Across: Uncharged particle in nucleus (7)NEUTRON
- 11 Across: Mixture producing intense heat (7)THERMIT
- 12 Across: Large molecule essential for life (7)PROTEIN
- 2 Down: Wearing away of land by water or wind (7)EROSION
- 3 Down: Device for controlled nuclear reactions (7)REACTOR
- 4 Down: Group of similar living organisms (7)SPECIES
- 5 Down: Smallest discrete unit of energy (7)QUANTUM
- 7 Down: Positively charged particle (6)PROTON
- 8 Down: Naturally occurring inorganic solid (7)MINERAL
- 10 Down: Diffusion of water through a membrane (7)OSMOSIS
🔬 Science Crossword #2
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Across
- 2. Wearing away of land by water or wind
- 6. Naturally occurring inorganic solid
- 8. Device for controlled nuclear reactions
- 9. Positively charged particle
Down
- 1. Preserved remains of ancient life
- 2. Biological catalyst for reactions
- 3. One body blocking another in space
- 4. Solid with ordered atomic structure
- 5. Pure substance on periodic table
- 7. Uncharged particle in nucleus
Show answers
- 2 Across: Wearing away of land by water or wind (7)EROSION
- 6 Across: Naturally occurring inorganic solid (7)MINERAL
- 8 Across: Device for controlled nuclear reactions (7)REACTOR
- 9 Across: Positively charged particle (6)PROTON
- 1 Down: Preserved remains of ancient life (6)FOSSIL
- 2 Down: Biological catalyst for reactions (6)ENZYME
- 3 Down: One body blocking another in space (7)ECLIPSE
- 4 Down: Solid with ordered atomic structure (7)CRYSTAL
- 5 Down: Pure substance on periodic table (7)ELEMENT
- 7 Down: Uncharged particle in nucleus (7)NEUTRON
🔬 Science Crossword #3
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Across
- 4. Uncharged particle in nucleus
- 6. Mixture producing intense heat
- 9. Fourth state of matter
- 10. Force attracting objects to Earth
- 11. Group of similar living organisms
Down
- 1. Biological catalyst for reactions
- 2. Smallest discrete unit of energy
- 3. Solid with ordered atomic structure
- 5. Large molecule essential for life
- 7. Device for controlled nuclear reactions
- 8. Diffusion of water through a membrane
Show answers
- 4 Across: Uncharged particle in nucleus (7)NEUTRON
- 6 Across: Mixture producing intense heat (7)THERMIT
- 9 Across: Fourth state of matter (6)PLASMA
- 10 Across: Force attracting objects to Earth (7)GRAVITY
- 11 Across: Group of similar living organisms (7)SPECIES
- 1 Down: Biological catalyst for reactions (6)ENZYME
- 2 Down: Smallest discrete unit of energy (7)QUANTUM
- 3 Down: Solid with ordered atomic structure (7)CRYSTAL
- 5 Down: Large molecule essential for life (7)PROTEIN
- 7 Down: Device for controlled nuclear reactions (7)REACTOR
- 8 Down: Diffusion of water through a membrane (7)OSMOSIS
🔬 Science Crossword #4
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Across
- 3. Device for controlled nuclear reactions
- 4. Group of similar living organisms
- 8. Positively charged particle
- 9. Uncharged particle in nucleus
- 10. Diffusion of water through a membrane
- 11. Biological catalyst for reactions
Down
- 1. Substance providing immunity
- 2. Preserved remains of ancient life
- 5. Large molecule essential for life
- 6. Mixture producing intense heat
- 7. Wearing away of land by water or wind
Show answers
- 3 Across: Device for controlled nuclear reactions (7)REACTOR
- 4 Across: Group of similar living organisms (7)SPECIES
- 8 Across: Positively charged particle (6)PROTON
- 9 Across: Uncharged particle in nucleus (7)NEUTRON
- 10 Across: Diffusion of water through a membrane (7)OSMOSIS
- 11 Across: Biological catalyst for reactions (6)ENZYME
- 1 Down: Substance providing immunity (7)VACCINE
- 2 Down: Preserved remains of ancient life (6)FOSSIL
- 5 Down: Large molecule essential for life (7)PROTEIN
- 6 Down: Mixture producing intense heat (7)THERMIT
- 7 Down: Wearing away of land by water or wind (7)EROSION
🔬 Science Crossword #5
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Across
- 1. Positively charged particle
- 4. Naturally occurring inorganic solid
- 7. Uncharged particle in nucleus
- 9. Slow-moving river of ice
- 10. Center of an atom or cell
Down
- 2. Mixture producing intense heat
- 3. Solid with ordered atomic structure
- 5. One body blocking another in space
- 6. Preserved remains of ancient life
- 8. Wearing away of land by water or wind
Show answers
- 1 Across: Positively charged particle (6)PROTON
- 4 Across: Naturally occurring inorganic solid (7)MINERAL
- 7 Across: Uncharged particle in nucleus (7)NEUTRON
- 9 Across: Slow-moving river of ice (7)GLACIER
- 10 Across: Center of an atom or cell (7)NUCLEUS
- 2 Down: Mixture producing intense heat (7)THERMIT
- 3 Down: Solid with ordered atomic structure (7)CRYSTAL
- 5 Down: One body blocking another in space (7)ECLIPSE
- 6 Down: Preserved remains of ancient life (6)FOSSIL
- 8 Down: Wearing away of land by water or wind (7)EROSION
Solver Notes
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What are challenge crossword puzzles?
Challenge crossword puzzles are expert-level word games featuring advanced vocabulary, complex clue structures, and larger grids. They are designed for experienced crossword solvers who want to push their skills beyond standard difficulty levels.
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Challenge crosswords are best suited for adults and advanced students who already have strong crossword-solving experience. The difficult clues and specialized vocabulary assume familiarity with crossword conventions and a broad knowledge base.
How many challenge crossword puzzles are available?
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What is the difference between challenge and daily crosswords?
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