What describes rivers, streams and lakes?

What is the water that fills the space between particles of rock and soil?

A what is the top level of groundwater in aquafier?

What is an Aquifer?

When do convection currents form?

Winds generally blow from _____ to _____ over the USA due to a huge convection current over the North American continent and because of the rotation of the Earth.

What causes precipitation at fronts?

A forecaster would find the ___ most helpful to determine the climate.

A scientist studying climates finds a fossil of a fish in a desert. What can the scientist learn from the fossil?

What is the Earth's outermost and thinnest layer called?

Scientists study material that pushed through the cracks in the ____ to learn about the mantle and core of the Earth.

What is a non renewable resource?

Wind, water and sun are ____ energy sources?

Solar energy is used in a limited way because it is not ____ at all times.

____ reduces air pollution because it brings pollution back to Earth.

Limiting the crops grown prevents

An example of reusing a resource is turning a ____ into a ____

The warm ocean water has a higher salinity because it ____ more quickly

___ changes from day to day

___ is the average weather over a long period of time

Fossil fuels cause ____. Scientist are making ____ to run longer on ____ fuel.

It is important to use ______ wisely because there is not much of it.