Soil Study Guide

The top layer of the earth's surface is

• soil

• topsoil

• air

• bedrock

Part of the soil made up of dead plants and animals is?

• water

• humus

• subsoil

• clay

A mixture of sand, silt, clay that is best to grow plants because it holds water and contains nutrients is?

• air

• humus

• loam

• nutrients

What are the four parts of "good soil"?

• clay, sand, loam, silt

• hardness, color, streak, luster

• humus, topsoil, subsoil, bedrock

• water, air, humus, rock

What makes up 45% of "good" soil?

• air

• water

• rocks and minerals

• humus

Why is subsoil lighter in color than topsoil?

• it has more humus

• it has less humus

What is the order from top to bottom of the soil layers?

• topsoil, humus, subsoil, bedrock

• humus, topsoil, subsoil, bedrock

• bedrock, humus, subsoil, topsoil

The top layer of soil is called ________.

• bedrock
• topsoil
• subsoil
• grass

This is found in the topsoil and is made of decaying plants and animals. 

• dirt
• water
• humus
• subsoil

Tags

NGSS.5-LS2-1

This type of soil is sticky when wet and hard when dry. 

• clay
• silt
• sand
• gravel