It is one word: slideshow.
2 words: water slide
show one page, show two pages, and show printed page
Both the one-word and two-word forms are used, as different parts of speech.The verb is to show off (two words) meaning to display, or to grandstand.The noun is showoff, a person who seeks attention by his exploits.
It can be one word, although much more often seen as two words. Older dictionaries show it hyphenated stomach-ache.
It's one word. It's a compound word made up of two smaller words. An airline (one word) is a company that runs airplanes. An air line (two words) is a flexible tube or hose attached to an air or oxygen source supplying air or oxygen to a person who is ill or under water. Airlines and air lines, of course, are the plural versions.
There are two on a standard title slide. One is for the main title and one for the subtitle. You can also have a title only slide, which has just one placeholder.
out of
A Transform Boundary Is When Two Tectonic Plates Slide By One Another
an earthquake
an earthquake
"Bookwork" is one word, not two.
Access the slide show settings and enable presenter view