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Describe the formation of a waterfall?

Waterfalls form where there is a layer of hard rock on top of a layer of soft rock. The soft rock is eroded more quickly and undercuts the hard rock creating a ledge. The overhanging ledge is unsupported and...
EB
Answered by Emily B. • Geography tutor
4136 Views

describe the electrostatic force between water molecules

a type of wander waals force called hydrogen bonding due to the slightly positive hydrogens and slightly negative oxygen. this occurs because of the uneven attraction for electrons between the oxygen and hyd...
MS
Answered by Murray S. • Chemistry tutor
3148 Views

How does fractional distillation separate different hydrocarbons in crude oil?

Crude oil is a mixture of different hydrocarbons, which all have different lengths and must be separated by length into different useful 'fractions'. Fractional distillation achieves this by using the fact t...
SJ
Answered by Samuel J. • Chemistry tutor
17596 Views

How do I know which noun is masculine which is feminine?

In portuguese nouns have gender- masculine or feminine. Most masculine verbs end with -o, -im, -om, and -um. Most feminine nouns end with -a, -ção, -dade or -gem. Examples: Masculine o carro = a car o fim = ...
KJ
1483 Views

What's the difference between the Imperfecto and Indefinitivo tenses?

Both Imperfecto and Indefinitivo are past tenses. Imperfecto is a tense used to describe states, emotions, circumstances, settings - it implies that the action has not been finite in the past. For example: I...
KJ
Answered by Karolina J. • Spanish tutor
4434 Views