Space Science
Earth Science
Life Science
General
Physical Science
100

How long does it take for light to travel from the sun to the earth?

It takes 8 minutes

100

What is the inner core made of?

Iron and nickel

100

What is the average rate heart beats per minute in an adult?

60 to 100 beats per minute

100

What does PV=nRT stand for?

=pressure=volume=amount of substance=ideal gas constant=temperature

100

Can gold be created from other elements?

Yes

200

What is the farthest man made object?

Voyager 1

200

What causes climate change?

As greenhouse gas emissions the Earth, they trap heat, therefore climate change.

200

Why does the moon appear in the daytime?

It is reflecting light from the sun — and its closeness to Earth makes it brighter than the daytime or nighttime sky.

200

How much wood would woodchuck chuck if a woodchuck would chuck wood?

700 pounds

200

Can air make shadows?

The refraction of the light doesn't give air shadows.

300

What will happen to the sun in 5,000,000,000 years?

The sun will explode

300

What is the Rock Cycle and how does it work?

The rock cycle is a process that outlines how igneous, metamorphic, and sedimentary break down and form

300

Why is water wet?

When water molecules come into contact with a surface, these forces create the condition of a liquid being wet.

300

Where is the lab in Khan Lab School?

It doesn't have a lab

300

Can light bend through corners?

Light can bend through edges

400

What will humans have to do to the buildings if they live on mars?

Cover them with Martian dirt

400

Why does earth have tectonic plates?

As Earth's mantle heated and cooled over many millennia, the outer crust broke up and commenced the plate motion.

400

Why do we dream?

Dreaming helps you consolidate and analyze memories like skills and habits.

400

We are ___% neanderthals

2

400

Can fire have a shadow

Fire can have shadows

500

Why are conditions necessary for life?

Biogenic elements, a source of energy, liquid water, and a suitable, reasonably stable environment

500

How much does the earth weigh?

5.972 × 10^24 kg

500

What makes us human?

Bipedalism, language, and tool making.

500

What is the theory of relativity?

E = mc2

500

What do you say when someone is running down the street with your gold?

Au