A. Objective The learners should be able to investigate changes that happen in the absence of oxygen. B. Materials ● fire. Activity: TITLE: ABSENCE OF OXYGEN Jar with cover (Jar A) Jar without cover (Jar B) 2 same sized candle (small) Match or lighter Timer Ruler C. Precautionary Measure Remember to handle match or lighter carefully and don't play with it for it can cause D. Procedure 1. Label the jar with cover with Jar A and the jar without cover as Jar B. 2. Light the candles with a match and put the candles in each jar. 3. Record the time when the candles are lighted and the time when the light was put off. 4. Cover the Jar A and observe what will happen. 5. Measure the length of the candles after the flame was put off. 6. Record your findings on the chart below. Jars JAR A JAR B Time of the flame was put off Length of the candle after burning Answer the following questions: 1. Which of the 2 jars was the candle's flame put off first? 2. Which of the two candles has the shortest size? 3. What happen, when you cover the Jar A? 4. When the lighted candle in Jar A was covered, the flame was put off, what is the reason why the candle's flame did not continue to burn? 5. What are the 3 main components in combustion? Doss​

What is the layer of the soil

Answer:

The soil is typically composed of different layers, known as soil horizons. These horizons develop over time due to various soil-forming factors such as climate, organisms, parent material, topography, and time. The three main layers commonly found in soil profiles are:

1. Topsoil (A Horizon): This is the top layer of the soil, which is rich in organic matter and contains a high concentration of nutrients. It is usually darker in color and has a crumbly texture. This layer is essential for plant growth and provides a medium for plant roots, microorganisms, and invertebrates.

2. Subsoil (B Horizon): Below the topsoil, you will find the subsoil layer. It is lighter in color, denser, and generally contains fewer organic materials. It consists of mineral particles, clay, and dissolved materials leached from the topsoil. The subsoil may also have distinct features like accumulation of certain minerals or clay layers.

3. Parent Material/C Horizon: This layer is composed of the unweathered or slightly weathered rock material from which the soil is formed. It may contain fragments of rocks or different geological materials such as sand, silt, clay, or gravel. The composition of the parent material will influence the characteristics of the soil above it, as it provides the basis for soil development.

It is worth noting that soil profiles can differ significantly depending on the location and formation processes. Different soil classification systems may also recognize additional soil horizons or layers based on specific characteristics.