What is the difference between a low slope roof and a steep slope roof? A low-slope roof is one whose slope is less than 3:12, or 25%. A steep slope roof is a roof with a pitch of 25% or greater. Roof coverings for steep roofs fall into 3 categories: thatch, shingles, and architectural sheet […]
What kind of grass grows in the tundra?
What kind of grass grows in the tundra? Grasses in the Tundra Polar Grass (Arctagrostis latifolia) Polar grass grows from sea level to 5,500 feet in elevation with two subspecies growing in different parts of the world. Ice Grass (Phippsia algida) Vahl’s Alkali Grass (Puccinellia vahliana) Cottongrass (Eriophorum callitrix) Do pine trees grow in the […]
What does PreCambrian mean in Greek?
What does PreCambrian mean in Greek? Precambrian* – all the time prior to the start of the Cambrian (not a formal era/eon name) * synonymous with “Cryptozoic” – Greek for “hidden life” Proterozoic eon – Greek for “former life” What does period mean in geologic time scale? Period, in geology, the basic unit of the […]
What are abrasives give examples?
What are abrasives give examples? Some naturally occurring abrasives are: Calcite (calcium carbonate) Emery (impure corundum) Diamond dust (synthetic diamonds are used extensively) Novaculite. Pumice. Iron(III) oxide. Sand. Corundum. Which is the hardest synthetic abrasive? diamond Which type of abrasives are the strongest? Diamond Why is diamond a good abrasive? Diamond is useful as an […]
Do lions attack humans?
Do lions attack humans? Cases in Lindi have been documented where lions seize humans from the centre of substantial villages. It is estimated that over 250 people are killed by lions every year. Man-eating lions studies indicate that African lions eat humans as a supplement to other food, not as a last resort. Do lions […]
Is a potential energy?
Is a potential energy? Potential energy, stored energy that depends upon the relative position of various parts of a system. A spring has more potential energy when it is compressed or stretched. A steel ball has more potential energy raised above the ground than it has after falling to Earth. What are the units of […]
What is the best evidence in the text for the prediction that Champollion will eventually figure out the T hieroglyph?
What is the best evidence in the text for the prediction that Champollion will eventually figure out the T hieroglyph? The only hieroglyph that confused Champollion was the one for “T,” which was different in the two names. What is the best evidence in the text for the prediction that Champollion will eventually figure out […]
Is it OK to use microwave everyday?
Is it OK to use microwave everyday? (Of course, the heat in a microwave isn’t harmless — so you should never put, say, a living creature inside of a microwave. “Microwaves are part of the electromagnetic waves we’re exposed to daily. When you bake bread, you’re exposed to electromagnetic waves and infrared energy from the […]
What are two ways to increase kinetic energy?
What are two ways to increase kinetic energy? If you double the mass of an object, you double the kinetic energy. If you double the speed of an object, the kinetic energy increases by four times. The word “kinetic” comes from the Greek word “kinesis” which means motion. Kinetic energy can be passed from one […]
Which group is very unreactive?
Which group is very unreactive? noble gases Why does group 18 have no charge? Noble gases are relatively inert and nonreactive due to their full outer shell of electrons. Having a full valence shell of 8 electrons means that the atom is already in its most stable state, and thus, there is no need for […]