Space
The third planet from the sun..?
Earth
Why does chewing gum take seven years to digest?
Swallowed chewing gum does not stay in your system for seven years. Gum, along with anything else inedible, passes through our excretory system and out of the body.
What is the difference between biotic and abiotic factors?
Biotic factors are living things. It also includes things that were once living and are now dead/non-living.
Abiotic factors are non-living things.
Can a fire have a shadow?
Yes
What is Mars also known as?
The Red Planet
Why are veins blue?
The veins themselves are not blue, but are mostly colorless. It is the blood in the veins that gives them color. We can also not say that the blood in our veins is blue. The blood in our veins appears blue because we are looking at our veins through layers of skin and fat.
What is the name for the calculations to estimate a person's total C02 emissions?
Carbon Footprint
Difference between longitudinal and transverse waves?
Transverse waves are always perpendicular to wave motion. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves.
What keeps space empty? (Excluding the planets)
Space is NOT empty. It is filled with gas, dust and wind and radiation.
Do blind people dream in visual images?
Yes, blind people do indeed dream in visual images. even though a person who lost his vision may be currently blind, his brain is still able to draw on the visual memories and on the related brain circuits that were formed before he went blind.
What is a biosphere?
A biosphere is the set of all of the ecosystems on the planet.
Light waves are electromagnetic waves while sound waves are mechanical waves. Light waves are transverse while sound waves are longitudinal. Light waves can travel in vacuum. Sound waves require a material medium to travel, and hence, cannot travel in vacuum.
How does a black hole give off light?
A black hole itself does not give off any light. That is why it is called black. However, matter that is near a black hole can give off light in response to the black hole's gravity.
Is human blood ever any color other than red? If so, explain.
Yes, human blood is green in the deep ocean. The spectrum of the blood changes according to oxygen saturation values.
What is another name for C02, water vapor, methane and CFCs?
Greenhouse gases
What keeps a bicycle balanced?
Bicycles are stable because of the gyroscopic effect of the spinning front wheel or because the front wheel "trails" behind the steering axis, or both. ... This "trail" gives the force of the ground on the front wheel a lever arm to cause steering in a way that can help restore balance.
How long can a human in outer space last without a spacesuit before exploding?
Humans DO NOT explode in space :)
But they die for the same reason as people who are left too long underwater: lack of oxygen.
Do humans only have five senses in the body?
There are not just five senses in a human body. There is another sense that deals with how your brain understands where your body is in space. This sense is called proprioception. Specific kinesthetic receptors exist for detecting stretching in muscles and tendons. The flight or fight response is also a sense.
What are the side effects of smoking on ecosystems ?
Cigarette smoking causes environmental pollution by releasing toxic air pollutants into the atmosphere. The cigarette butts also litter the environment, and the toxic chemicals in the residues seep into soils and waterways, thereby causing soil and water pollution.
Why is the sky blue?
Gases and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter, smaller waves.