2nd Grade Science - 2nd Grade Science

The best option to prevent the hill from continuing to be eroded is to plant new grass. The roots of the grass will absorb water and hold the dirt in place. As wind and rain wear things down and move them away, humans must come up with solutions to prevent it from getting worse. The other answers are not reasonable or will not work. Leaves will not absorb the water and will wash away, leaving it alone will allow the problem to get worse, and putting a slide on the hill is dangerous!

The damage from Hurricane Katrina permanently changed the area and the land of New Orleans. The floodwaters destroyed many buildings, and when the water receded to the ocean, it dragged dirt, rocks, and debris along with it changing the landscape. The city could install barriers or levees to block the water from passing into the city. There were already some in place, but there could be taller levees installed or more of them.

Shrubs and tall plants next to fields of wheat, corn, and other crops help act as a windbreak and stop the wind and dust from tearing up the fields. If the soil is very dry, it will get swept up by the strong winds and create a tornado-like force that will bury all of the crops in dust and dirt. The shrubs block the soil from being picked up, and the wind from pushing through the crops the farmers are growing.

This beautiful canyon was formed by years and years of wind and water pushing through the ground and blowing against the sides. Erosion is the movement of broken down Earth to new places, and that is what the river and wind in this area have done. The water races through the canyon, cutting a path while the wind blows tiny particles of soil and sand into the walls breaking it away slowly and moving it to new places. Many times humans get involved and try to prevent wind and water from damaging areas.

This is a widespread problem on many farms, especially in the mid-West, where it is very dry and can get windy. The best option to prevent the wind and water from changing the land's shape and damaging her farm is to water the soil to keep it wet and less dusty, plant tall shrubs to help block the wind, and rotate the crops, so the nutrients in the ground are not all used up. If farms are left to become very arid and dusty, it can create large dust storms and damage property and change the land over many miles.

The best and most reasonable way to stop wind or water for changing the shape of the land would be to plant shrubs and trees to hold the soil together. Tree roots stabilize and secure the soil helping it from being eroded. This process can help control erosion (the movement of broken-down materials), so there are fewer changes to the Earth.

Floodwaters rush into the city and destroy homes, roads, and tear up plants. It would NOT be a good idea to place large umbrellas near the sides of the town to block the rain to stop the land from changing. This would not prevent a flood or keep erosion from taking place.

Beach erosion is widespread and changes the shape of the land forever. The most reasonable and practical way to slow the wind and water would be to bring in sand and plants to rebuild the beach; this will add more shoreline and help to strengthen the coast. This should help slow some of the erosion and stop the land from changing.

This cliffside was formed by years and years of wind and water pushing through the ground and blowing against the sides. Erosion is the movement of broken down Earth to new places, and that is what the ocean and wind in this area have done. The water smashes into the cliffside, cutting a path while the wind blows tiny particles of soil and sand into the walls breaking it away slowly and moving it to new places. Many times humans get involved and try to prevent wind and water from damaging areas.

These aerial photos allow scientists to make comparisons of the same area over time to look for changes or similarities. In these photos, scientists could see that the shoreline has changed over the years. There is a reduction in the land visible, and more of it is underwater. The coastline has receded and become more narrow.

The item that is most likely describing the seashell is "Item 1". A seashell has all of the matching observable properties, so it could be classified in the same category. A seashell is hard, does not bounce, is irregularly shaped, tan, and would feel rough to the touch. None of the other items would be a match.

Steven should guess "Item 4" is a match to his teddy bear because they share the same observable properties. The teddy bear is brown, soft, smooth, would not bounce, and is an irregular shape. The other items could not be classified as a teddy bear.

"Item 2" is described as hard, not bouncy, square, green, and smooth to the touch. When reviewing the answer choices, they are all green but have other observable properties that would not allow them to be classified as "Item 2". The tennis ball is round, the block is rough on top and rectangular, and the leaves are irregular shaped. The only answer choice that matches the characteristics is the cube.

Observable properties are characteristics of an object or material that can be gathered using the five senses. When looking through each category, there is a common property that groups the items. In "Category 3," all of the items are brown, so they are classified by color.

Observable properties are characteristics of an object or material that can be gathered using the five senses. When looking through each category, there is a common property that groups the items. In "Category 1," all of the items are rectangular, so they are classified by shape.

Observable properties are characteristics of an object or material that can be gathered using the five senses. When looking through each category, there is a common property that groups the items. In "Category 2," all of the items are round, so they are classified by shape.

A green gummy bear would not fit into any of the categories based on its observable physical characteristics. "Category 1" is all rectangular or square objects, "Category 2" are round items, and "Category 3" is all brown items. A green gummy bear would need to be placed in a new category.

When looking at items or materials, we can classify them based on their observable properties. If we look at the different descriptions of all four items and then think about a tennis ball, some similarities can be found between item 4 and a tennis ball. They can be described with the same properties, so they fall into the same category.

When looking at items or materials, we can classify them based on their observable properties. If we look at the different descriptions of all three items and then think about a baseball, some similarities can be found between item 2 and a baseball. They can be described with the same properties, so they fall into the same category.

Observable properties are characteristics of an object or material that can be gathered using the five senses. When looking through each category, there is a common property that groups the items. In "Category 3," all of the things are brown, so they are classified by color. In "Category 2," all of the items are round, so they are sorted by shape. In "Category 1," all of the things are square or rectangular, so they are also categorized by shapes. The category that a notebook would best fit in is "Category 1".