Use the drop-down menus to order the steps for writing chemical names from chemical formulas.
Identify the negative ion and write its name. Replace the ending with the suffix -ide.
Write the complete chemical name, with the name of the positive ion written first.
Identify the positive ion and write its name as is.
Intro

Amethod of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.

The correct answer is  "c".  it is "c" because melting is an endothermic change, and endothermic get's energy from surroundings. 

Iassume the answer is 75 feet. inwards to outwards rather than outwards to inwards. probably be 75.hachures are stokes drawn in direction of the steepest slope. a series of short parallel lines drawn on a map to indicate topographic relief. it is actually called hachures on contour lines. the small marks in the center of the feature are called hachures.observe the picture attached