Vocabulary

• due to: Because of; owing to
• as a whole: Considering everything together; in general.
• on the ground: Located on the surface of the earth.
• no matter: Regardless of; it does not matter.
• wait for: To wait until someone comes, or something happens
• to do with: To be about something; concern
• ultimately: Done or considered as the final and most important
• stick: To push a sharp or pointed object into something
• critical: Making a negative judgment of something
• slightly: Only a little
• realize: To become aware of or understand mentally
• positive: Showing agreement or support for something
• structure: The way in which the parts of a system or object are arranged or organized, or a system arranged in this way
• negative: The opposite to a positive electrical charge
• tend: To move or act in a certain manner
• develop: To explain something in steps and in detail
• solid: Being able to be trusted; reliable
• molecule: Two or more atoms chemically combined
• neutral: Something with pH value of 7
• bit: Device put in a horse's mouth to control it
• bond: Rope, chain or other thing used to tie someone up
• affect: To cause a change in something else
• occur: To come to pass or to happen
• similar: Nearly the same; alike
• tiny: Very, very small
• remain: To be left behind; to continue to exist
• explain: To make clear or easy to understand by describing
• surface: To give (road) a top layer
• form: Sports team or person's current winning record
• charge: To run quickly toward someone to attack them
• compare: To consider how similar and different things are
• identical: The same in every way
• expand: To make something larger in size, number, amount
• rub: To spread a cream, etc., using a repeated motion
• due: When something is required or expected
• ground: To break (coffee, etc.) into tiny bits with machine
• oxygen: A gas in the air that we need to breathe
• shape: The outer form of something, what it looks like
• produce: Fresh foods such as fruits and vegetables
• fall: Season after summer and before winter; Autumn
• layer: One of several sheets of a material or object
• activity: An action or task, e.g. sports, washing clothes
• depend: Be controlled or determined by (someone/something)
• friction: Disagreement between two or more people
• formation: Process of creating; making a particular shape
• humidity: Amount of moisture in the air in a particular area
• catch: Amount of something that has been caught
• vapor: Tiny droplets or pieces of some substance spread thinly throughout the air
• hydrogen: Lightest of all chemical elements
• melt: To disappear or to go away
• shell: Hard outer cover of an egg, fruit, nut, or seed
• repel: To make or force someone or something go away
• differentiate: To see or show how things are not the same
• atom: Smallest bit that matter can be broken down into
• symmetrical: Having parts that are exactly the same
• cube: Solid object that has six square sides
• snowflake: A single crystal of snow
• electron: A negatively charged particle
• symmetric: Having parts that are exactly the same