What's the difference between crater and scoria?

Crater

Definition:

(n.) The basinlike opening or mouth of a volcano, through which the chief eruption comes; similarly, the mouth of a geyser, about which a cone of silica is often built up.
(n.) The pit left by the explosion of a mine.
(n.) A constellation of the southen hemisphere; -- called also the Cup.

Example Sentences:

(1) "Acoustic" craters were produced by two laser pulses delivered into a saline-filled metal fiber cap, which was placed in a mechanically drilled crater.
(2) Combined SEM and TEM examination of the endothelium of compressed segments revealed "craters" and "balloons", blebs and vacuoles, swollen mitochondria, dilated granular endoplasmic reticulum, and subendothelial edema.
(3) If overloaded, these areas are subject to "cervical cratering," a common prelude to implant failure.
(4) It's brown, crusty and cratered, like somewhere Hubble may have sent back a photo of.
(5) The country’s other attractions include a burning pit at “the door to hell” in the Darvaza crater, and rarely seen stretches of the silk road, the region’s ancient trade route.
(6) The only reminder of what happened is a small, blackened, crater near the northern part of town, where a rocket laced with a nerve agent fell, killing more than 70 people in one of the worst mass casualty chemical attacks in the six-year war in Syria .
(7) Following one or more hours of ischaemia crater-like depressions and blebs appeared on the luminal surfaces of ventricular endothelial cells, with margination and clumping of nuclear chromatin, loss of glycogen granules, swelling of mitochondria, and the development of subendothelial membrane-bound dilatations of myocytes.
(8) Invagination-like craters were observed in the plasmalemma.
(9) Histology for the 213-nm ablation showed a clean ablation crater with minimal collagen lamellae disruption and a damage zone less than 1 micron.
(10) Irradiation directly on the left endocardial and epicardial walls lasted for 10 seconds and was repeated 3 times, creating 3 craters.
(11) Efficacy parameters included daytime and nocturnal symptom relief and duodenal ulcer healing, documented by endoscopy, and defined as complete reepithelization of the ulcer crater.
(12) Patients in groups I (45 patients) y II (28 patients), were submitted to a vaporization crater of the whole transformation zone because of having the cervical canal free of lesion.
(13) Fibrin and exposed collagen fibers were seen at the crater base.
(14) When the RF probe approached perpendicularly to the cadaver arterial wall, a crater with charring and coagulating necrosis was formed.
(15) Residents of Aden’s central Crater district told Reuters that Houthi fighters and their allies were in control of the area by midday on Thursday, deploying tanks and foot patrols through its otherwise empty streets after heavy fighting in the morning.
(16) A rough surface of epitheliocytes has deep craters and irregular protrusions, microvilli, cilia and spherical bodies.
(17) the esophageal lesion revealed a variety of macroscopic manifestations including giant rugae, submucosal nodules, multiple erosions, and craters.
(18) Those differences can be summarized as follows: (1) the occurrence of pronounced, highly curved hackle marks, which could in many instances be mistaken for conchoidal marks;(2)the appearance of the beveled edges bordering the cratering on the side opposite origin of force; and (3) a more apparent tendency toward an inverse relationship of muzzle velocity and energy to radial fracture length and degree of curving along crater boundaries.
(19) None of these suggest a bumper year for the high street, since the jobless total is going up, house prices are going down, consumer confidence has cratered and real disposable income in 2011 saw its biggest fall since 1977.
(20) Photoablation was continued until aqueous appeared percolating through the juxtacanalicular tissue at the bottom of the crater; a water-tight closure of conjunctiva was then performed.