Why is the outer core a liquid?
Tremendous heat keeps the outer core a liquid.
How can you move a bucket without spilling any water?
Spin it! The rotational forces keep the water inside the bucket.
Give an example of 3 different simple machines.
Answers will vary.
The inner core of earth is very hot. Why is it still a solid?
The pressure keeps the metal in earth's core solid.
What is one reason why Saturn has so many moons?
It is BIG, so it has lots of GRAVITY
Name 3 simple machines
There are six simple machines: screw, inclined plane, wedge, lever, wheel and axle, and pulley.
Newton's Second Law states that _________ objects need less force to move.
Lighter
What is the direction of the earth's orbit?
Counterclockwise
Tell me one place where it is night when it is day in Saigon.
Any country in the Western Hemisphere
A rocket must be strong enough to escape the Earth's _________.
Gravity
How long does it take for the earth to orbit 1 time?
365.25 days (1 year)
What is the direction of the moon's orbit?
Counterclockwise
What is the hydrosphere?
All the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface, such as clouds.
What are the word stems in atmosphere?
Atmo = air or vapor + sphere = globe
How long does it take for the Earth to rotate 1 time?
24 hours (1 day)
What is the deepest layer of Earth we have explored?
The crust
Why do we orbit the sun?
We orbit the sun because its gravity is strong and pulls us.
A satellite is something that ________ around another celestial body.
Orbits
What layer of the atmosphere is the closest to us?
Troposphere
Why do we have day and night?
Our planet spins on an invisible line — called 'an axis'. Half of the Earth is always facing the Sun, meaning it is lit up and is daytime!
What is the most popular lever that people in Vietnam and some other Asian countries use everyday?
Chopsticks
What is Newton's Third Law?
Newton's third law of motion states that for every action, there is an equal and opposite reaction.
How long does it take for the moon to orbit the sun 1 time?
365.25 days (1 year)
When it is night in the western hemisphere, where is it day?
The eastern hemisphere (the opposite part of the globe)
_________ the action of moving around an axis.
Rotation
If the earth didn't spin on its ________ we would not have day & night.
Axis
How long does it take for the sun to rotate 1 time?
27 days (1 month)
What layer of Earth do we stand on?
The crust
What are the word stems in hydrosphere?
Hydro = water + sphere = globe
What is special about the troposphere?
It contains the air we breathe!
_________ is the curved path of a celestial body. Earth's is elliptical (egg-shaped)
Orbit
What levers are in the classroom?
scissors, door hinge, etc.
Which of Newton's Laws is also known as the Law of Inertia?
The 1st Law: an object at rest or in motion will stay that way, unless acted upon by another force or an unbalanced force
How long does it take for the sun to orbit 1 time?
Trick question! The sun doesn't orbit anything, it is the center of our solar system.
What are the word stems in biosphere?
Bio = life + sphere = globe
Tell me 3 things a force can do.
Forces can make an object: 1) start moving, 2) speed up, 3) slow down, 4) stop moving, or 5) change direction.
Where can we find liquid rock?
The mantle
If you see the words 'equal' and 'opposite', which of Newton's Laws should you think of?
Newton's Third Law!
How long does it take for the moon to orbit the earth 1 time?
27 days (1 month)
What is the biosphere?
All of the life on earth's surface
What is the outer layer of the atmosphere called?
Exosphere
What is an example of a wedge?
A knife, an axe
What are three examples of wheels and axles?
Bike, car, skateboard, scooter, motorcycle, shopping trolley, etc
Name the earth's layers in order.
Inner core, outer core, lower mantle, upper mantle, crust
What is an example of a pulley?
An elevator
What is the direction of the sun's orbit?
Trick question! The sun doesn't orbit anything.
What are the two rotational forces?
Centripetal & centrifugal force
Why don't Venus & Mercury have moons?
Their gravity isn't strong enough (the sun's gravity is so strong it would "steal" their moons)