Earth Science

Soil organisms mix the soil and make space in it for _______ and water.

The geologic events and the evolution of life forms as shown in the fossil record

A landform that has high elevation and more or less level surface.

A ____________is a solid copy of the shape of the organism.

Scientists divided time between Precambrian Time and the present ____ units of time, or eras.

The process by which a glacier picks up rocks as it flows over the land.

Change over time; the process by which modern organism have descended from ancient organisms.

You can use the _____ scale to measure how acidic soil is.

_____________ is the term geologist use for underground water.

Times when continental glaciers cover a large part of Earth’s surface are called ____________.

A landform made up of flat or gently rolling land with low relief.

Type of landscape in rainy regions where caverns, sinkholes, and deep valleys are common.

Dark-colored organic material in soil.

The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in _______ Era.

Scientist studied rock layers and _________ when they first developed the geologic time scale.

What type of fossils provide evidence of the activities of ancient organisms?

A measure of how well soil supports plant growth.

The time span of Earth’s past is so great we use the_____ time scale to show Earth’s history.

The layer below topsoil that has less plant and animal matter and has little humus.

A record of geologic events and life forms in Earth’s history.

40. Glaciers erode the land through the process of plucking and _________________.

By which process does a glacier pick up rocks?

Vegetation, such as grasses, ___________ runoff.

Which increases runoff?

One of the units of geologic time into which geologists divide eras.

Which process forms humus?

A glacier deposits sediment when it ____________.

Preserved remains or traces of an organism that live in the past.

The crumbly, topmost layer of soil made up of clay and other minerals and humus.

Rich, fertile soil that is made up of about equal parts of clay, sand, gravel, and silt.

Groundwater can cause erosion through ____________ weathering.

An organism that gets energy by breaking down wastes and dead organisms.

A petrified fossil is a fossil in which ______________ replace all or part of an organism.

Refers to a group of related organisms that has died out.

Which of the following substances is not able to preserve entire organisms?

A cone shaped deposits that rises from the floor of a cave is known as ___________________.

During the ice ages, ____________ glaciers covered large parts of Earth’s surface.

What makes up soil besides rock particles, minerals, air, and water?

A landform with high elevation and high relief.

One of the three long units of geologic time between Precambrian and the present.