Science 3G Ch 3C McGrath Soils Science Review Chapter 3C Flash Cards!

What is soil? the loose material in which plants can grow in the upper layer of Earth Social Studies 3G Ch 3f

Why is soil important? Soil contains the minerals all living things need. Social Studies 3G Ch 3f

Name the 4 parts of soil weathered rock humus air water Social Studies 3G Ch 3f

Material made up of decayed parts of once-living things is humus Social Studies 3G Ch 3f

Soil is a nonrenewable resource. It can not be replaced in a lifetime. How many years does it take to make 1 inch of soil? 500-1,000 years Social Studies 3G Ch 3f

Name the 3 layers of soil topsoil subsoil bedrock Social Studies 3G Ch 3f

The richest layer of soil is Topsoil Social Studies 3G Ch 3f

Describe topsoil The top layer of soil. It is made of the smallest grains and has the most humus. This makes it the richest layer of soil, and good for growing plants. Social Studies 3G Ch 3f

Describe subsoil The layer under topsoil. It has larger grains and less humus than topsoil. Social Studies 3G Ch 3f

Describe bedrock The solid rock under the soil. Weathering breaks down the bedrock into soil. Bedrock is made of different minerals in different places. So different soils have different minerals. Social Studies 3G Ch 3f

Name the 3 types of soil sand loam clay Social Studies 3G Ch 3f

A type of soil that has large grains. It also has large spaces between the grains which causes water to drain quickly. sand Social Studies 3G Ch 3f

A type of soil that has small grains and holds water easily. It can stick together. clay Social Studies 3G Ch 3f

A type of soil which has both large and small grains. It has lots of humus, which makes it dark and rich. It holds enough water for plants, but also drains well. loam Social Studies 3G Ch 3f

Material found in nature that living things use is resource or natural resource Social Studies 3G Ch 3f

Saving resources by using them carefully is conservation Soil is a nonrenewable resource. It must be saved. Social Studies 3G Ch 3f

Name 3 ways to conserve soil do not till the soil strip cropping contour plowing Social Studies 3G Ch 3f

Planting rows of thick grass or clover between crops is called… strip cropping Social Studies 3G Ch 3f

A type of plowing which helps keep soil from washing down hill is… contour plowing Social Studies 3G Ch 3f

What is a mixture of decaying organisms such as leaves, which turns into soil quickly compost Social Studies 3G Ch 3f

The best soil for growing plants is… loam Social Studies 3G Ch 3f

How does bedrock turn into soil? weathering Wind, rain and roots of plants break down rock into smaller pieces Social Studies 3G Ch 3f

How can water help topsoil? Water that soaks into topsoil is needed for plants to grow. Social Studies 3G Ch 3f

How can water hurt topsoil water can erode topsoil. Erosion is the washing away of soil. Social Studies 3G Ch 3f

How do minerals end up in our bodies? Minerals are absorbed by plants from the soil. Animals eat the plants. Social Studies 3G Ch 3f

How do plants stop erosion? Roots hold soil in place so it cannot wash away. Social Studies 3G Ch 3f

How can farming hurt soil? Growing the same crop year after year causes the soil to loose all the minerals needed. Social Studies 3G Ch 3f

Use the next link to watch a Discovery Education video on soil. 1D45 Science Select resources day/earth_day_crafts.html 1D day/earth_day_crafts.html Social Studies 3G Ch 3f