Summarize the evidence indicating that over several hundreds of years or more there have been variations in the level of the solar activity.

What did Galileo invent from the lenses of his spectacles

Which of the following transfers heat by electromagnetic waves? a. radiation b. conduction c. convection d. temperature

There are billions of stars in the universe how are they classified

Onomic models a. are constructed to mirror reality as closely as possible, and in this respect economic models are no different from other scientific models. b.

The vertical displacement of an ocean wave is described by the function, y = A sin (ωt - kx). k is called the wave number (k = 2π/λ) and has a value of k = 18 rad/m. The remaining values are A = 9.5 m and ω = 14.5 rad/s.

How many earth years does it take mars to orbit the sun

Which represents a system that is almost completely closed?

If many household substances classify as acids or bases what is the ph scale

A protostar forms once the nebular cloud condenses and the core begins

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are