Given a scientific question, generate a correct answer to it.

Q: Exemplified by cesium, which ignites spontaneously in air, pure elements with a high metallic character tend to be very what?

A: reactive
****
Q: Bog destruction in scotland is an example of the widespread loss of what kind of habitat?

A: wetland
****
Q: What is the process by which some solids transition directly into gases?

A:
sublimation
****