Spacecraft must have shields to protect the from

friction caused moving through the atmosphere

heat builds up generated by solar power

collision with other objects like comets

When analyzing tree rings, what do scientists assume a thin ring indicates?

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water