1. C - Uneven thickness is not evidence of centuries of flowing
Historical manufacturing produced uneven glass. Room-temperature flow is far too slow to explain the windows.
2. B - It does not make food radioactive
Microwaves transfer energy as heat. Their non-ionizing radiation does not make food radioactive.
3. A - They retain no charge; trees are unsafe shelter
Touching a lightning victim does not electrocute a rescuer. Sheltering under a tree is unsafe.
4. D - It rotates; its far side receives sunlight
Synchronous rotation keeps roughly the same face towards Earth. The far side still has day and night.
5. C - It is not visible unaided from the Moon, but can be photographed from orbit
NASA photographs show sections from orbit using lenses. The unaided-view-from-the-Moon claim is a myth.
6. B - Corals are animals; bleaching can be survived
Bleached corals have lost symbiotic algae. They are stressed, but not necessarily dead.
7. A - It is dispersed debris, with microplastics dominating the item count
Garbage patches contain scattered debris across large areas and depths, not walkable islands.
8. D - An underwater landslide can generate one without an earthquake
A sudden displacement of water can generate a tsunami. Landslides and volcanic activity are possible causes.
9. C - It conducts poorly; dissolved ions increase conductivity
Dissolved ions carry electrical current. Everyday water should still be treated as an electrical hazard.
10. B - Liquid water is densest near 4°C; ordinary ice is less dense
Fresh water reaches maximum density near 4°C. Its ordinary solid form floats.
11. A - All three can coexist at the triple point
Ice, liquid water and water vapour can coexist in equilibrium under specific triple-point conditions.
12. D - It travels faster in seawater than air, with speed affected by temperature and pressure
Ocean temperature and pressure change sound speed and can create channels that carry sound great distances.