Q: Answer the following question given this paragraph: The speed of sound in air is approximately , where is the temperature of the air in Celsius. The speed of light is 300,000 km/sec, which means it travels from one place to another on Earth more or less instantaneously. Let's say on a cool night (air temperature Celsius) you see lightning flash and then hear the thunder rumble five seconds later. How far away (in km) did the lightning strike?. Q: What travels at a rate of 300,000 kilometers per second, or nearly instantaneously? Choices: - air - sound - gravity - light A:
A: light

Q: Answer the following question given this paragraph: Chemical reactions follow the laws of thermodynamics. Q: Chemical reactions follow the laws of what? Choices: - Newton - quantum physics - photosynthesis - thermodynamics A:
A: thermodynamics

Q: Answer the following question given this paragraph: The supertree also shows that another major diversification of mammals occurred about 50 million years ago. Again, worldwide climate change may have been one reason. This time Earth's temperature rose. The warmer temperature led to a greater diversity of plants. This would have meant more food for mammals or their prey. Q: A major diversification of what animal group occurred about 50 million years ago, possibly spurred by worldwide climate change? Choices: - reptiles - amphibians - insects - mammals A:
A: mammals

Q: Answer the following question given this paragraph: To understand minerals, we must first understand matter. Matter is the substance that physical objects are made of. Q: What substance are physical objects are made of? Choices: - gravity - energy - friction - matter A:
A: matter