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8th Science 1
Ch. 1
Question | Answer |
---|---|
What measures the pull of gravity on an object | weight |
A good scientific experiment includes | several constant factors and one variable |
What are substances composed of only one type of atom called | elements |
In order for soil to drain well and not retain excess water, it must contain | sand |
Humus is formed as a result of | decomposition |
The type of soil that contains a mixture of sand, silt, clay and humus is | loam |
The primary plant food element found in the ashes of burned fruits is | potassium |
A substance having a pH of 10 would be | basic |
A theory that has never been proven false is called a | law |
a fertilizer bag labeled 10-8-14 would contain 10% of the element | nitrogen |
What measures the amount of matter in an object | mass |
Plants that have short stems, few leaves, and a pale green color need the plant food element | nitrogen |
Nitrates are formed by | lightning, nitrifying bacteria, nitrogen-fixing bacteria |
Legumes allow nitrogen-fixing bacteria to form swellings called ?? on their roots | nodules |
What measures how tightly packed matter is | density |
A sensible explanation to a scientific problem is | hypothesis |
What are substances composed of two or more elements bonded together called | compounds |
The primary plant food elements are | nitrogen, phosphorus, potassium |
When scientists perform experiments, they record facts and information called | data |
The study of soil is | pedology |
The study of the matter and movement of God's physical creation is | science |
To express acidity and basicity of substances, chemist use the | pH scale |
The upper surface of ground water is the | water table |
Soil and porous rock that cannot hold any more water are said to be | saturated |
any soil material primarily derived from living organisms | organic |
any soil material derived from nonliving matter | mineral |
breakdown of organisms | decompose |
substance composed of decayed organisms' particles | humus |
reusing old materials | recycling |
process that breaks rocks down into soil | weathering |
top 2 to 6 inches of soil | topsoil |
layer of solid rock below the soil | bedrock |
What is the substance of the physical world called | matter |
What is an area of ground water collected in a layer of rock or soil | aquifer |
What is a "self-pumping" well called | artesian well |
what is the upward movement of water through a tiny space in response to surface tension | capillarity |
What are the most basic units of matter | atoms |
What are the air pockets called that are found in the soil | pore spaces |