Astronomers can find the distance to an object if they know the object's true brightness. one way they regularly estimate the true brightness of a galaxy is to observe

The rock cycle includes all of the steps except which of the following? a. magma or lava cools. b. sediments melt deep beneath earth's surface. c. extreme heat and pressure form metamorphic rocks. d.

The water ways of Europe have provided channels of trade, linking Europe to what continent

Why does cool air sink in the eye of a storm?

Until the early There were only negligible amounts of free oxygen in the atmosphere

How did Manchester grow from a village to an industrial city

Is gender inequality improving the world?

Hallite is a mineral formed by

Assume that our Moon is hit by 25 million tiny meteorites every day. On average, it takes about 20 such impacts to obliterate a footprint left by an Apollo astronaut on the surface of the Moon.

In China what was the purpose of the Great Cultural Revolution?

How are renewable and nonrenewable resources alike and different