The magnetic field produced by earth is called the (a)   ?

The hardest material that composes the earth's crust is called (a)   ?

When molten rock solidifies, it forms (a)   rock?

Sand and mineral fragments that have been pressed together form (a)   rock?

Rock that has been changed by extreme heat or pressure into a new kind of rock is known as (a)   rock?

Over 75% of the earth's surface is covered with (a)   rock?

What part of the cave is this?

(a)  

What part of the cave is this?

(a)  

What part of the cave is this?

(a)  

What part of the cave is this?

(a)  

What part of the cave is this?

(a)  

Where does the earth's magnetic field come from?

(a)  

How does the earth remain magnetized?

(a)  

Explain how a solution cave is formed.

(a)  

Is a solution cave forming an example of physical or chemical weathering? Why?

(a)  

The hardest known mineral; found in pipes

(a)  

Small deposits of igneous and metamorphic crystals

(a)  

any hollow space in the earth's crust that has formed naturally and is large enough for a person to enter

(a)  

any rock containing a metal together with impurities

(a)  

the rarest, most durable and beautiful gem

(a)  

the most commonly used practical metal; used for thousands of years to make tools

(a)  

a metal that is a good conductor of electricity; two of its alloys are brass and bronze

(a)  

any trace of a plant or animal left in a rock

(a)