Q: When sparks from a steel grinder react with oxygen, what do they form? Choices: - rust - spontaneous combustion - steel oxide - iron oxide A:
iron oxide

Q: When a rock is altered by heat from a nearby magma, what occurs? Choices: - sublimation - evaporation - form metamorphism - contact metamorphism A:
contact metamorphism

Q: Q: What distant and extraordinarily energetic objects now seem to be early stages of galactic evolution with a supermassive black-hole-devouring material? Choices: - pulsars - stars - neutrinos - quasars A:
A: quasars

Question: Q: Root-like projections anchor adults of what colony-dwelling animals to solid surfaces such as rocks and reefs? Choices: - anemones - corals - molluscs - sponges A:
Answer: sponges

*Question*
Q: How do bacteria reproduce? Choices: - budding - nuclear fission - sexual reproduction - binary fission A:
**Answer**
binary fission

Q: Scientists use a quantity called __________ as a measure of disorder, or randomness. Choices: - chance level - motion - vector count - entropy A:
entropy