What is fire class7?

Fire is the result of a chemical reaction. This is what we call fire. To burn a piece of paper or wood, we heat it before it catches fire. Oxygen comes from the air.

How is fire a friend?

Lay out the course of action as succinctly and honestly as you possibly can. You need to lay out the case just as you would any other employee. If a boss told you to fire your friend, it's ok to pass the buck. Present the reasons as honestly as possible for the firing and offer your sympathy to your friend.

Why is the fire called a friend?

Fire is indeed a friend but, as we know, it can be a dangerous enemy once it gets out of control. The discovery of fire and its various uses had helped early man to cope with nature better. Moreover, it was due to fire that we were able to adopt a settled mode of life.

What is lava Class 7 short?

1. Igneous rocks: Lava is the hot molten magma that reaches the Earth's surface through cracks and crevices during a volcanic eruption. This cools down and solidifies below the Earth's surface or on it to form rocks. These rocks are known as igneous rocks.

Why fire is a good servant class 7?

Answer: Fire is a good servant. When kept under control fire helps us do many things in most of our home we cook our food on fire. We use fire to keep us warm during extreme winter. It is also used to generating electricity.

What is this fire?

Fire is a chemical reaction that converts a fuel and oxygen into carbon dioxide and water. It is an exothermic reaction, in other words, one that produces heat.

What are uses of fire?

Fire has been used by humans in rituals, in agriculture for clearing land, for cooking, generating heat and light, for signaling, propulsion purposes, smelting, forging, incineration of waste, cremation, and as a weapon or mode of destruction.

What is lava answer?

lava, magma (molten rock) emerging as a liquid onto Earth's surface. The term lava is also used for the solidified rock formed by the cooling of a molten lava flow. The temperatures of molten lava range from about 700 to 1,200 °C (1,300 to 2,200 °F).

What is lava Class 7 Brainly?

Brainly User. Answer: Lava is the melted rock which comes out from the volcano during volcanic eruption. it is formed due to the huge pressure and heat on the rocks below so it comes out in liquid form known as Lava.

What is magma and lava?

Scientists use the term magma for molten rock that is underground and lava for molten rock that breaks through the Earth's surface.

What is fire short answer?

Fire is the product from a chemical reaction between oxygen in the atmosphere and some sort of fuel. Oxygen, fuel and heat are needed for fire to occur. This is known as the fire triangle. Combustion is when fuel reacts with oxygen to release heat energy.

What was the first fire?

The oldest fire recorded on Earth has been identified from charcoal in rocks formed during the late Silurian Period, around 420 million years ago.

Who invented fire?

Today, many scientists believe that the controlled use of fire was likely first achieved by an ancient human ancestor known as Homo erectus during the Early Stone Age.

How fire is a good servant?

Fire is a good servant. When kept under control fire helps us do many things. In most of our home we cook our food on fire. We use fire to keep us warm during extreme winter.

How do we control fire?

The most common method to control a Class-A fire is to remove heat by spraying the burning solid fuels with water. Another control method would be to reduce the oxygen content in the immediate vicinity of the fire (i.e., "smother" the fire), such as by the introduction of an inert gas such as carbon dioxide.

How fire is our enemy?

fire is both friend and enemy in our daily life and in our future. The early people of the world has used fire. ... so we can say that it is being both foe and friend . when fire is under control then it is friend and when fire is over control then it is a foe.

What is lava Class 5 answer?

Lava: Molten magma that flows out onto the surface of the earth is called lava.

What is lava short question?

Lava is molten rock generated by geothermal energy and expelled through fractures in planetary crust or in an eruption , usually at temperature from 700 to 1200 celcius . The structure resulting from subsequent solidification and cooling are also sometimes described as lava.

Is lava always liquid?

Lavas range in temperature from about 800 °C (1,470 °F) to 1,200 °C (2,190 °F). This is similar to the hottest temperatures achievable with a forced air charcoal forge. A lava is most fluid when first erupted, becoming much more viscous as its temperature drops.

Is lava a water?

Lava does contain a lot of water, especially prior to eruption (when it's called magma), but also as it flows across the ground,' he explained. 'As mentioned, though, water boils off immediately at those temperatures so it's not liquid or even vapor water within the lava.

Why do you think some igneous rocks have a glassy texture like the Obsidian?

Glassy or vitreous textures occur during some volcanic eruptions when the lava is quenched so rapidly that crystallization cannot occur. The result is a natural amorphous glass with few or no crystals. Examples include obsidian and pumice.

Why is lava so hot?

Lava is hot for two primary reasons: Pressure and radiogenic heating make it very hot deep in the Earth (about 100 km down) where rocks melt to make magma. The rock around the magma is a good insulator so the magma doesn't lose much heat on the way to the surface.

How is fire important?

Fire removes low-growing underbrush, cleans the forest floor of debris, opens it up to sunlight, and nourishes the soil. Reducing this competition for nutrients allows established trees to grow stronger and healthier. History teaches us that hundreds of years ago forests had fewer, yet larger, healthier trees.

What are the uses of fire class 7?

Solution: Fire is used in cooking, to keep our homes warm during winter. Fire is also used to produce electricity. If fire goes out of control, it can cause damage to our life, house and property.

What causes fire?

Fire is the result of applying enough heat to a fuel source, when you've got a whole lot of oxygen around. As the atoms in the fuel heat up, they begin to vibrate until they break free of the bonds holding them together and are released as volatile gases. These gases react with oxygen in the surrounding atmosphere.

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