12 Questions
Which component of soil is described as a crucial natural resource made up of tiny particles of rocks, decayed plants, water, and gases?
Topsoil
What percentage of Earth's water exists in seas and oceans according to the text?
Over 90%
What is the primary source of energy for the Earth as mentioned in the text?
Sun
Which component influences weather conditions due to its conditions?
Air
Which type of soil is known for its distinct characteristics affecting plant growth and water retention?
Loam
What is the function of the A horizon in the soil profile according to the text?
Supporting plant life
What is the primary component of the Earth's surface according to the text?
Soil
Which of the following is not a main type of soil mentioned in the text?
Gravel
What is the function of the C horizon in the soil profile?
Parent rock
What is the primary source of energy for the Earth mentioned in the text?
The sun
What percentage of the Earth's surface is covered by water?
70%
Which component of the Earth is described as influencing weather conditions due to its conditions?
Air
Study Notes
- The fourth quarter of Grade 4 science focuses on earth and space, highlighting soil, water, and air as the main components of the Earth, with the sun being the primary source of energy.
- Soil is a crucial natural resource made up of tiny particles of rocks, decayed plants, water, and gases, located at the uppermost layer of the Earth's surface.
- Water covers 71% of the Earth's surface, with over 97% of Earth's water existing in seas and oceans, referred to as underground water mandito.
- The Earth is enveloped by the atmosphere, influencing weather conditions due to its conditions.
- There are three main types of soil: clay, loam, and sand, each with distinct characteristics affecting plant growth and water retention.
- Other types of soil include topsoil, silt soil, sweet soil, and chalk soil, each with unique properties like moisture retention, fertility, and alkalinity.
- The soil profile consists of different layers: O horizon (organic litter zone), A horizon (topsoil), B horizon (subsoil), C horizon (parent rock), and D horizon (bedrock), each with specific functions in supporting plant life.
Explore key components of the Earth including soil, water, air, and the sun as the primary source of energy. Learn about different types of soil, their characteristics, and the soil profile's various layers supporting plant life.
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