13 True-or-False Questions from Britannica’s Easiest Science Quizzes

Question: All matter has mass and density.

Answer: Mass is the amount of material that an object is made of. Density is a comparison of two things with the same volume. Oil floats on water, for instance, because it is less dense than water.

Question: Skin serves no real purpose.

Answer: Without skin, we would not be able to survive temperature extremes, bacteria, viruses, ultraviolet rays, and other elements. Skin is a critically important organ.

Question: An endangered species is at risk of extinction.

Answer: An endangered species has suffered population declines that put it at risk of extinction.

Question: Tectonic plates move very quickly.

Answer: On average, Earth’s tectonic plates move at about the same rate as that at which fingernails grow, just a few inches (centimeters) a year.

Question: Most human babies are born exactly on their due dates.

Answer: Less than 10 percent of all babies arrive on their due dates. Doctors use these dates only as rough estimates of a baby’s arrival.

Question: Lightning rarely strikes skyscrapers.

Answer: Lightning often strikes the tallest point in a given area, including tall buildings. The Empire State Building in New York City, for instance, is struck about two dozen times per year.

Question: All chemical reactions can be reversed.

Answer: Many chemical reactions can be reversed. But some, such as baking a cake, cannot be reversed.

Question: When horses run, all four feet leave the ground.

Answer: A horse’s way of running is called a gallop. While galloping, the horse is airborne for an instant, with all four of its feet off the ground.

Question: Marine organisms are largely unaffected by global warming.

Answer: Warming ocean waters and increased ocean acidification are stressors on many forms of marine life.

Question: Crude oil is a fossil fuel.

Answer: Crude oil and natural gas are fossil fuels, which are carbon- or hydrocarbon-based fuels naturally formed from ancient organic matter.

Question: Tomatoes are fruits.

Answer: Although tomatoes are listed as vegetables for nutrition, they are fruits botanically.

Question: A person would weigh more on Earth than on the Moon.

Answer: The Moon’s gravitational pull is much smaller than Earth’s. A person on the Moon would therefore weigh only a fraction of what they would on Earth.

Question: The ocean sometimes stands still.

Answer: The ocean never stops moving. Its circulation affects global climate.