When the Apollo 11 crew landed on the Moon in 1969 and brought back the first samples of lunar rocks, researchers found that lunar soil was in fact powdery.

When blunt, they tend to produce powdery sawdust, rather than the longer, clean shavings characteristic of a sharp chain ; a sharp saw also needs very little force from the operator to push it into the cut.

When the disease begins to develop, it looks like a white powdery substance.

When erosion threatened the foundation of their home in Harbert, Paula Sandburg planted grapevines and arranged the snow fences which helped hold the sands away.

When it finds prey, it pounces and punches through the snow to catch its victim.

When the term first surfaced circa the late 1980s / early 1990s, it was used for adult sports such as skydiving, scuba diving, surfing, rock climbing, snow skiing, water skiing, snowboarding, mountain biking, mountaineering, storm chasing, hang gliding, and bungee jumping, many of which were then growing in popularity.

When air masses move up and over mountains, the air cools producing orographic precipitation ( rain or snow ).

When heavy, wet snow with a snow-water equivalent ( SWE ) ratio of between 6: 1 and 12: 1 ( in extreme cases, as heavy as 4: 1 ) and a weight in excess of 10 pounds per square foot (~ 50 kg / m < sup > 2 </ sup >) piles onto trees or electricity lines – particularly if the trees have full leaves or are not adapted to snow – significant damage may occur on a scale usually associated with hurricanes.

When the ski is set at an angle the edge cuts into the snow, the ski will follow the arc and hence turn the skier ; a practice known as carving a turn.

When a modern ski is tilted on to its edge, a gap is created between the ground and the middle of the ski ( under the binding ) as only the sides near the tip and the tail touch the snow.

When this was found only partially successful an extensive process of building snow sheds over some of the track to protect it from deep snows and avalanches was instituted.

When rapid parallel turns are quickly linked together, the upper body remains pointed down the fall line, and the lower body and skis are alternately driven into the snow in one direction and then the other.

When the ski was rotated on-edge, the aluminum sheets prevented the wooden core from twisting longitudinally, and kept much more of the ski's edge firmly pressed into the snow.

When the mine closed for good ; the snow which once tormented Telluride's miners had become the town's new gold, in the form of skiing and tourism.

When landmasses are concentrated near the polar regions, there is an increased chance for snow and ice to accumulate.

When the rivers froze, the cargo was transferred to sleds and the expedition continued, enduring blizzards and waist-high snow.

When snow does fall, it usually melts upon making contact with the ground.

When the German military took delivery of the first vehicles, they immediately put them to the test on-and off-road in snow and ice to test their capability at handling European winters ; several four-wheel-drive vehicles were used as reference points.

When compared with spectacles, contact lenses typically provide better peripheral vision, and do not collect moisture such as rain, snow, condensation, or sweat.

When she is finished, her plaid is pure white and snow covers the land.

When news reached him that king Rusas I of Urartu was moving against him, he turned back to Lake Urmia in forced marches and defeated a Urartian army in a steep valley of the Uaush ( probably the Sahend, east of Lake Urmia, or further to the south, in Mannaea country ), a steep mountain that reached the clouds and whose flanks were covered by snow.

When not erupting Hekla is often covered with snow and small glaciers, it is also unusually aseismic with activity only starting 30 – 80 minutes before an eruption.

When the 66 settlers from Wales came the land was covered in a blanket of snow, hence the name Gwynedd.

When Murray ordered the line forward, their ammunition carts had become bogged in the snow.

When the original negative was examined, however, no snow or ice could be seen, the " snow " in the original having been due to the sun reflecting off the wings, which was clarified when examining the negative rather than the published pictures which had been produced from a copy negative.

When I say move, a guy moves ''!!

" When the tone poem moves into the blues, " our American friend ... has succumbed to a spasm of homesickness.

When the wind blows horizontally, it presses on and moves the ball ; because ping-pong balls are very lightweight, they move easily in light winds.

When rates move higher, the bond part of a convertible bond tends to move lower, but the call option part of a convertible bond moves higher ( and the aggregate tends to move lower ).

When the price of the stock the bond is convertible into moves higher, the price of the bond tends to rise.

When the particle moves, its velocity is

When a pilot moves the control column ( or sidestick ), a signal is sent to a computer ( analogous to moving a game controller ) the signal is sent through multiple wires ( channels ) to ensure that the signal reaches the computer.

When the listener moves slightly to the side, however, this phantom channel disappears or is greatly reduced.

When a river is in flood, it is at its most powerful, and moves the greatest amount of sediment.

When the hailstone moves into an area with a high concentration of water droplets, it captures the latter and acquires a translucent layer.

When the piston moves further down and the cylinder doesn't have anymore gases, fuel mixture starts to flow to the combustion chamber and the second process of fuel compression starts.

Operation: When the piston moves from bottom dead center ( BDC ) to top dead center ( TDC ) the fresh air and fuel mixture enters the crank chamber through the intake port.

When a key is depressed, it moves a magnet, which is detected by the solid-state sensor.

" When " Air steps " or " aerials " such as the Hip to Hip, Side Flip, and Over the Back ( the names describe the motion of the woman in the air ) began to appear in 1936, the old guard of dancers such as Leon James, Leroy Jones, and Shorty Snowden disapproved of the new moves.

When the Union of South Africa was founded in 1910 the colony was still controlled by the British and moves were made to transfer it to the Union.

When a body at these points is perturbed, it moves away from the point, but the factor opposite of that which is increased or decreased by the perturbation ( either gravity or angular momentum-induced speed ) will also increase or decrease, bending the object's path into a stable, kidney-bean-shaped orbit around the point ( as seen in the rotating frame of reference ).

When a charged particle moves through a magnetic field B, it feels a Lorentz force F given by the cross product:

" Actor Jack Nicholson once said, " When Marlon dies, everybody moves up one.

When the moon is closer to the earth, it moves faster ; when it is farther, it moves slower.

When León became the first city in Nicaragua to fall to the Sandinistas, he responded with aerial bombardment, famously ordering the air force to " bomb everything that moves until it stops moving.

When you bend backward the top ( base ) of the sacrum moves forward relative to the ilium ; when you bend forward the top moves back.

When the important action shifts to a new position in the frame, the operator moves the scanner to follow it, creating the effect of a " pan " shot.

When the temporal weapon fires on an object, it moves that object outside the space-time continuum, eliminating the object from causality not only in the present and the future, but also the past, changing history to a state where the object never existed.