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Science, Math & Nature

Across
Lowest level of the atmosphere
Majority of the sun is made up of ______
Elementary particle that is a unit of light
A system of rapid mental math calculation
Planet with the most moons
68% of the universe
Thickest layer of Earth
An element that is liquid at room temperature and pressure
Down
Transports oxygen to and from the tissues
A fundamental relation among three sides of a right triangle
These crustaceans don't die of old age
Second element on the periodic table
This fruit takes two years to grow
Nocturnal birds that don't have eyeballs
Newton's laws of ____
Positively charged subatomic particle
Father of modern physics