All categories

3 years ago

How does volcano form and erupt?

1 answer:

6 0

Formed-
Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.

Erupts-
When it's underneath the surface, the molten rock is called magma. When it reaches the surface, it erupts as lava, ash and volcanic rocks. With each eruption, rocks, lava and ash build up around the volcanic vent where the material blasts out of.

You might be interested in

2. A 260 em cylinder container was used to collect an undisturbed soil sample. The container and soil weighed 403 g when dried.

sineoko [7]

Answer:

The Bulk density = 1.3 g/cm³

the porosity of the sample is 132 cm³

Explanation:

Given:

Volume of cylinder = 260 cm³

Mass of container and the soil = 403 g

Mass of the empty container = 65 g

Thus,

The mass of the soil is = 403 - 65 = 338 g

Now,

The Bulk density = $\frac{\textup{Mass}}{\textup{Volume}}$

The Bulk density = $\frac{\textup{338 g}}{\textup{260}}$

The Bulk density = 1.3 g/cm³

also,

average particle density for mineral soil is usually given as 2.65 g/cm³

i.e the air present in the given soil sample has reduced its density from 2.65 g/cm³ to 1.3 g/cm³

The mass of the whole sample = Volume × Density

= 260 × 2.65

= 689 gm

but,

The actual mass of the dry sample = 338 g

thus,

Mass of air in the sample = 689 - 338 = 351 g

Therefore,

the volume of 351 g soil = $\frac{\textup{mass defect of soil}}{\textup{density of soil}}$

= $\frac{\textup{351}}{\textup{2.65}}$

= 132.45 cm³

so the porosity of the sample is 132 cm³

4 0

3 years ago

When children imitate what they see, or learn through the observation of others, this is best described as __________ learning.

dolphi86 [110]

I think its called observational learning

(If i get this wrong Im srry)

3 0

2 years ago

Although China's total economic output, measured by Gross Domestic Product (GDP), is third largest in the world, it is

SVEN [57.7K]

I would say B because of their population

6 0

2 years ago

Childhood illnesses can be predicted using a population pyramid system.

timurjin [86]

Answer:

I think it's true

Explanation:

BRAINLIEST?

3 0

2 years ago

Which country was the site of ethnic tensions and a civil war between the Hutu and Tutsi in the 1990's?

labwork [276]

Rwanda (4) was the site of ethnic tensions and a civil war between the Hutu and the Tutsi in the 1990s. In early to middle 1994, the Hutu ethnic majority murdered nearly 800 thousand people, mostly from the Tutsi minority group. The act of attempting to annihilate an ethnic minority by an ethnic majority is known as a genocide. In Rwanda, the genocide began in the capital city of Kigali and spread throughout the rest of the country with lightening speed. It was a brutal and violent period in Rwandan history.

7 0

2 years ago