What makes us think that mars must once have had an atmosphere that was warmer and had higher surface pressure?

You add 10 drops of hot water to the cold water in a clear beaker without stirring. After a short time, the water is warm throughout. Which law of thermodynamics explains the change in temperature? third law second law first law

4. Which is a chemical property of wood?

In 1915 the German geologist and meteorologist Alfred Wegener first proposed the theory of continental drift, which states that parts of the Earth's crust slowly drift atop a liquid core.

How many valence electrons does a neutral atom of hydrogen have

It is important to organize your data because It allows you to prove your hypothesis is correct It allows you to quickly spot trends or patterns It is a required element of scientific investigation You can always assume that lab equipment provided

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.

How are trade winds affected by the coriolis effect

When a raw egg gets heated into an edible egg is this considered a physical or chemical change?

Starting at its rightmost position, it takes 2 seconds for the pendulum of a grandfather clock to swing a horizontal distance of 18 inches from right to left and 2 seconds for the pendulum to swing back from left to right.