Rocks
What are the three main types of rocks?
Igneous, metamorphic and sedimentary rocks
Is cutting a carrot a physical or chemical change?
Physical. It changes the size and shape, but the carrot is still a carrot.
Three main types of soil
clay soil, loam and sandy soil
Which is a better heat conductor, silver or gold?
Gold
What makes different minerals and rocks have different colors or shapes?
Minerals and rocks have different colors due to their chemical composition and impurities, which affect how they absorb and reflect light.
What happens in solidification?
Solidification is the transformation of liquid to solid, such as the formation of ice.
Which soil has very small particles that are very tightly packed?
Clay soil
Why could your hand get burnt if you stirred hot soup with a metal spoon?
Because metal is a good heat conductor.
give two examples of metamorphic rocks
marble and gneiss (etc.)
What is a chemical change?
It is a change that is irreversible and it creates a new substance.
Describe two ways that organic farmers use to maintain the composition of their soil
Two ways organic farmers maintain soil composition are through crop rotation and adding organic matter like compost or manure.
Why do most wires use copper instead of gold?
Most wires use copper instead of gold because it is much cheaper, with an ideal balance of high electrical conductivity, physical strength, and durability that makes it practical for mass production.
What is the rock cycle?
The rock cycle is the continuous process by which the three major rock types—igneous, sedimentary, and metamorphic—are created, transformed, and destroyed by Earth's internal and external forces.
Boiling point of water is?
100 °C
How is soil formed, and what are the five soil-forming factors?
(Climate, parent material, topography, organisms, and time)
It's the measure of a substance's ability to conduct an electric current. It is the reciprocal of resistivity.
Why are some rocks rough and others smooth?
Some rocks are rough because of their coarse-grained formation or the cemented-together fragments they are made of, while others are smooth due to rapid cooling of volcanic lava, the abrasive action of wind and water over time, or a fine-grained composition.
Is a candle burning a physical or chemical change? Chemical. The wax reacts with oxygen to form new substances like carbon dioxide and water, and heat and light are produced.
Chemical. The wax reacts with oxygen to form new substances like carbon dioxide and water, and heat and light are produced.
How long does it take for soil to form?
(It can take hundreds of years to develop just a few centimeters of soil)
Is wood a good conductor or a bad conductor?
A bad conductor