What is the name of the lowest layer of Earth's atmosphere?
troposphere
stratosphere
What percentage of the cells in your body are bacteria?
90% bacteria and only 10% human cells
90% human cells and only 10% bacteria
How long does it take for light to travel from the Sun's surface to the Earth?
8 light-years
8 minutes and 20 seconds
What is the largest living structure on Earth?
Great Barrier Reef
Mount Everest
The average person has about … liters of blood.
10
5
How many earthquakes are there worldwide each year?
over 1 thousand
over 1 million
Who invented dynamite?
Marie Curie
Alfred Nobel
How much skin will the average person shed during their lifetime?
over 50 kg
over 100 kg
CH3COOH is the chemical formula for what common household item?
vinegar
olive oil
Mycology is the study of what?
fungi
bacteria
What discovery earned Wilhelm Röntgen the first Nobel Prize for Physics?
Penicillin
X-rays
Why are sharks and rays different from other fish?
They have no bones.
What is the smallest biological unit of a living organism?
cell
gene
What is the symbol for Potassium?
K (derived from Neo-Latin, kalium)
What has the highest atomic number of any non-radioactive element?
iron
lead
What is Jupiter's largest moon?
Ganymede
Europa
